I have seen people perceive mere disagreement to be a personal attack against them and go totally berserk.
I recall a moderator on the breast cancer support forum doing this after I simply pointed out an error in his reasoning, even though it was not an attack. He went totally berserk erasing the post then going on an attack spree while encouraging others to join in with him on the attacks. He still continues with subtle attacks and dwells on the fact that he was proven wrong by making subtle references to the thread still.