I hear you. I don't take criticism that well on papers. But I've gotten better about it by learning to enter super-rational-zone when I know I'm about to get criticism-- the whole "this is not about how good or how flawed I am, this is a gift from the universe to help me get better, I'm allowed to disagree but I must do so on rational grounds" etc. It only helps when I'm ready for it, though.

I sometimes feel bruised on the messageboards. But I try to be superrational when I feel like I'm getting defensive. It may not be the healthiest way of doing things though.