I've played Jack in a few Alternate games and he has been fine. I have played others who were miserable SOBs. No idea why they even take a random invite, to behave the way they do.
It's why they call it "stranger danger", I guess.
HCJ's forum posts have never been a problem, either.... legitimate questions, no attitude, etc.
I'm not explaining or defending...just stating my few personal experiences with him.
ct