"Why not use JAB ingame?"
Good question.
Because that's not my online name. Would you change your real-life name just because someone didn't like it? I treat my online name as if it's one and the same as my RL name. Indeed, "J_A_B" is likely all most of you will ever know me as. I've used this name so long--in AW, in Quake, in CS, in AoK, in a dozen other games or more, on ICQ, in almost every newsgroup and forum I've ever been on, even in a lot of my Emails--that it really IS part of who I am. I'm not the kind of guy who constantly changes his internet ID just to anonomously trash people; I've never had a "shades" account in a game and never will. The fact that I essentially lose my "face" when I log into AH SERIOUSLY reduces the fun factor of the game for me.
If it didn't really matter to me, I wouldn't constantly bring it up.
J_A_B