A jury has retired to consider its verdict in the case of a man and a woman accused of killing a man in Trafalgar Square.
Ian Baynham, 62, was subjected to homophobic taunts before being knocked to the ground, then kicked and stamped on, the Old Bailey heard.
He died 18 days after the central London attack in September last year.
Joel Alexander, 20, and Ruby Thomas, 18, both from south-east London, deny manslaughter.
Brian Altman QC, prosecuting, said the incident began on 25 September when Ms Thomas, aged 17 at the time, began insulting Mr Baynham as he walked past them with a friend.
"Ruby Thomas was quite deliberately and provocatively hurling homophobic abuse," he said.
A confrontation broke out with Ms Thomas allegedly hitting Mr Baynham and striking him with her handbag.
Mr Baynham then grabbed one of the defendant's friends Rachel Burke and hit her before Mr Alexander delivered a "devastating punch" to his jaw, the jury had been told.
He added the two females began kicking his head and stamping on his chest when Mr Baynham was lying on the ground.
Mr Altman added: "The story of this case is the all-too-familiar story of drunkenness and loutish behaviour, though these defendants went far beyond anti-social behaviour."
Mr Baynham died after a skull fracture and brain damage caused by the fall, the court heard.
Ms Thomas, of Bourdon Road, Anerley, and Mr Alexander, of Talbot Road, Thornton Heath, deny manslaughter.
Mr Altman told the jurors they should not speculate on why Ms Burke was not in the dock.