Aaron Crane does seem to be a bit of a dick
Looking at his Twitter thread
"At the event in question, someone said something antisemitic to me, apparently thinking I’d be amused by it"
OK, so a joke in bad taste? These things happen, and not everyone judges tone correctly. The issue is intent, surely?
"I explained that to the person who’d said it; they said that “other Jewish people” had found it funny, which wasn't and isn't relevant"
Wasn't it? It seems pretty relevant to me. It shows that the intent was to amuse, not to insult.
"I’ve been accused of lying about something that happened at a Perl event in 2019. These accusations rely on using my relative silence on the matter to convince others I'm lying, which is why I'm being explicit now"
By "explicit" apparently he means talking constantly about how offended he was by a joke without telling us what the joke was.
Aaron seems to be a very self-entitled individual with a martyr complex.
I'm not convinced that the acceptability of a joke is based on the teller's ability to prove that not a single person in the world would be offended by it.