I must admit that on a purely personal level this is the sort of thing that makes my blood boil:
To be fair, I have a tendency to write somewhat formally when I launch into technical subjects, which may give a moron the impression that it was copied from somewhere. Also to be fair, EU apologized later “for being a dick”. But this kind of accusation really rankles me. My interactions with EU in that thread left a lasting impression. Since then there’s been a recurrence of similar behaviour, followed by similar backing-off. Whether this is trolling, stupidity, or just plain weirdness is unclear.