Coskun, an atheist, also shouted “Islam is religion of terrorism” and “Quran is burning” during his protest in Rutland Gardens, London.
During his demonstration, a man emerged from a nearby building and slashed at him with a large knife, later telling police he was protecting his religion.
The attacker was given a suspended jail sentence in September.
Perry told the court that this attack was “effectively provoked” by Coskun’s actions.
In June 2025 Coskin was convicted of a religiously aggravated public order offence of using disorderly behaviour “within the hearing or sight of a person likely to be caused harassment, alarm or distress”, motivated by “hostility towards members of a religious group, namely followers of Islam”, contrary to the Crime and Disorder Act 1998 and section five of the Public Order Act 1986.
Coskun was provided accommodation by the Home Office after his protest outside the consulate because of threats made to him.
He is resisting the legal challenge and attended the hearing before Lord Justice Warby and Ms Justice Obi, which concluded on Tuesday.
A judgment is due at a later date.