He/she/they disrupted a forum I posted in, not long ago.
Also, was banned from the Iodine forum, so this behaviour is habit, rather than an isolated incident. I think they're had many user names over time and a long history of disruptive behaviour.
Their tact included attempting to change the subject, make comparisons of me with other posters, say things about me that couldn't possibly be true, insult me, put words in my mouth of things I never wrote, and also to insult my dear late mother.
I'd ban their IP address from this site if I had the ability to do so.