> Part of working effectively with a group is learning to take blunt non-personal critcism in stride.

I agree. If conversation involved two people, both speakers and listeners should make efforts to improve how criticism works. Listeners can help by not taking everything personally.

Coming up with a failed design doesn't mean you're a failed human being. It doesn't even mean you're bad at your job. Learn something, improve, and you'll design something even better next time.