Background
Mark Latham and Alexander Greenwich are both members of the New South Wales Parliament and political opponents. Greenwich is openly homosexual and a prominent advocate for the LGBTQIA+ community. In late March 2023, in the context of the NSW state election, Greenwich publicly described Latham as “a disgusting human being” in a statement republished by the Sydney Morning Herald. About a week later, on 30 March 2023, Latham posted a tweet responding to that statement. The tweet contained explicit profane language describing male anal intercourse and posed the rhetorical question whether that was “disgusting,” directly linking Greenwich’s sexual activities to the notion of being a disgusting human being.
Greenwich sued Latham in the Federal Court of Australia for defamation, relying on two imputations: first, that he engages in disgusting sexual activities (arising from the tweet’s natural and ordinary meaning); and second, a true innuendo that he is not a fit and proper person to be a member of the NSW Parliament because of those activities. The primary judge upheld the first imputation, rejected the second, found serious harm to Greenwich’s reputation under s 10A of the Defamation Act 2005 (NSW), rejected Latham’s defences of honest opinion and common law qualified privilege (reply to attack), and awarded $140,000 in damages including an aggravated component: Greenwich v Latham [2024] FCA 1050. Latham appealed; Greenwich cross-appealed the rejection of the true innuendo.
The Full Court (Colvin, Wheelahan and Abraham JJ) heard the appeal over two days in November 2025 and delivered judgment on 10 June 2026.
The Court’s Holding
The Full Court dismissed both the appeal and the cross-appeal. On the first imputation, the Court held that the primary judge correctly applied the ordinary reasonable reader standard. Applying the single meaning rule, the ordinary reasonable reader of the tweet on Twitter — a casual, conversational medium where impression rather than deep analysis governs — would immediately have understood that its sting was that Greenwich engages in a disgusting sexual act involving faecal matter, not merely that he is homosexual. Latham’s attempt to recast the tweet as a bland statement about male homosexual intercourse was rejected; the strength of the language, its profanity, and its framing as a basis for describing Greenwich as a disgusting human being conveyed far more. The imputation was therefore conveyed in the tweet’s natural and ordinary meaning and was defamatory, since it would lead ordinary reasonable people to think less of Greenwich. The cross-appeal on the true innuendo — that Greenwich was unfit for Parliament — was dismissed because the extrinsic facts relied on (knowledge of the Metcalfe tweet and that Greenwich was an MP) did not support that additional meaning.
On serious harm, the Court held that the primary judge was entitled to infer from the nature of the language and the wave of online abuse and vitriol directed at Greenwich in response to the tweet that his reputation had been substantially harmed among ordinary reasonable people, not merely among those who already harboured prejudice toward homosexual men. The defences also failed: honest opinion failed because Latham’s opinion was not based on proper material for comment, and qualified privilege (reply to attack) failed because the attack was not commensurate with the occasion — the tweet’s sexual denigration bore no proportionate relationship to Greenwich’s original criticism of Latham’s public conduct as a parliamentarian. The $140,000 damages award was found to be soundly reasoned and not manifestly excessive. Latham’s application for leave to amend his notice of appeal on the aggravated damages ground was dismissed because the respondent had failed to make relevant submissions at trial, and no error was established.
Key Takeaways
- The ordinary reasonable reader of a social media post is assessed by impression, not textual analysis; the Full Court confirmed that profane language in a tweet that links a person’s sexuality to disgust conveys a defamatory imputation in its natural and ordinary meaning, not mere description of a sexual orientation.
- Serious harm under s 10A of the Defamation Act 2005 (NSW) can be established by inference — including inference drawn from the nature of the language used and the intensity of online abuse provoked by the publication — without direct evidence of individual reputation loss.
- The common law defence of qualified privilege as a reply to an attack requires proportionality; a sexually denigrating response to a political criticism of a public official’s conduct does not meet that standard and will not attract protection.
- A defence of honest opinion fails where the opinion is not grounded in proper material for comment; using profane sexual commentary as supposed “opinion” about a political opponent does not satisfy the statutory defence under s 31 of the Act.
- A party who fails to make relevant submissions at trial on a damages issue (here, aggravated damages) will not be granted leave to amend a notice of appeal to raise that issue on appeal.
Why It Matters
This decision is a significant appellate authority on defamation by social media in Australia. It confirms that courts will not accept a reductive reading of offensive tweets that strips them of their evident sting, and it underscores that the single meaning rule requires courts to give effect to the meaning an ordinary reasonable social media user would take from a post as a whole — including its profanity, tone, and rhetorical framing — rather than the meaning the publisher asserts was intended. The case also provides important guidance on inferential proof of serious harm, a threshold requirement introduced by the 2020 amendments to harmonised Australian defamation law.
For public figures who trade insults with political opponents on social media, the ruling is a clear warning that a gratuitous sexual attack offered as a “reply to attack” will not be shielded by qualified privilege and that the award of substantial damages — here $140,000 — is available even for a single tweet. The case also joins a growing line of Australian authority grappling with the intersection of political discourse, sexuality, and reputational harm in the online environment.