an ESTJ got blasted the moment he revealed his type.
It's a case of extreme type prejudice. Just the moment the male ESTJ started to post there, the other posters didn't even hesitate to give him lessons on how not to control other people's lives. The logic goes like this: He is a ESTJ and therefore he is an asshole and an intolerant person. His job, his age, his social life, his relationships with his family members, and whatever he has done in real life are insignificant comparing with his personality type, because it reveals who he really is.
It's beyond stupidity. Because ESTJ and ENTJ are superficially similar, I can only assume that ENTJ get the same treatment there and elsewhere.
This MBTI theory seems to have convinced so many people, that I think people who come to know you as an ENTJ would inevitably build up some negative preconceived ideas about you. They see you as an ENTJ, a representative of the type, the power hungry leader, but not you as you, a unique person with his own distinctive and remarkable qualities. Anything you did will be judged by how closely you resemble the ENTJ mold and the ENTJ behavior patterns. Anything that doesn't fit are seen either as your unique qualities or your effort to cover up your ENTJness to get along. Those who are obsessed with MBTI tend to think in line of the latter a lot.
It would take a lot of time to convince people of who you are, and not what you seem to be (ENTJ)... it's difficult to convince them because they think they got you figured out. So why let them know you are ENTJ at all in the first place?
I'd rather let them know I am a die-hard Nirvana fan.
About leadership, I agree with what BlueWing said in the first paragraph.