He's autistic. Apologised afterwards. etc Which one would expect a crowd championing (neuro)diversity would keep in mind.
The author of the original accusations for the petition latched onto every bit of tone-deafness they could tho. Saying he was transphobic since at some point where pronouns were only just becoming a thing in public discourse he discussed about the use of a default since something else seemed linguistically better to him. This because....well he was/is around a decent amount of trans people given he's very much not transphobic. He had again apologised publically about that one but it didn't matter.