Father Ted co-creator Graham Linehan has been cleared of harassing a transgender activist on social media but found guilty of criminal damage of their mobile phone outside a conference in London last year.

The 57-year-old flew in from Arizona to appear at Westminster Magistrates’ Court in person where judgment was delivered by District Judge Briony Clarke.

Linehan denied harassing Sophia Brooks on social media between 11-27 October last year, and a charge of criminal damage of their mobile phone on 19 October last year outside the Battle of Ideas conference in Westminster.

Judge Clarke said she did not find the complainant “was as alarmed or distressed” as they had portrayed themself to be after Linehan made a string of tweets about them.

Finding the writer guilty of criminal damage, Judge Clarke said: “The footage (of the incident) shows that just before phone is taken the defendant is angry and I found that he took the phone because he was angry and fed up.

“I am therefore satisfied he was not using reasonable force and therefore find him guilty of criminal damage.”

The trial heard that Brooks had begun taking photographs of delegates at the event during a speech by Fiona McAnena, director of campaigns at Sex Matters.

Outside the event, the activist asked Linehan: “Why do you think it is acceptable to call teenagers domestic terrorists?”

In response, the court heard that Linehan had called Brooks a “sissy porn-watching scumbag”, a “groomer” and a “disgusting incel”, with the complainant responding: “You’re the incel, you’re divorced.”

Prosecutor Julia Faure Walker told the court that Linehan had written “repeated, abusive, unreasonable” social media posts about Brooks, who he referred to as Tarquin.

The comedy writer, who has well-publicised strong views on gender issues, said his “life was made hell” by trans activists, adding that the complainant was a “young soldier in the trans activist army”.

The writer added: “He was misogynistic, he was abusive, he was snide.

“He depended on his anonymity to get close to people and hurt them, and I wanted to destroy that anonymity.”