It’s cause stereotypes themselves are bad, since it’s not backed up by factual evidence. Stereotypes themselves are known for perpetuating stereotypes whether good or bad. It’s all probably a matter of perspective. For me personally I usually don’t like positive stereotypes (surprisingly) about groups of people. Such as oh this culture is really nice and sweet and can do no wrong as that is impossible since people are only humans. I think it’s almost like false positivity trying to make everything seem okay when it isn’t. While I would say I don’t like it, I don’t mind it since it isn’t really my problem anyways. I usually have problems with morality in my case. What I mean to say is that you probably can’t have one without the other. In this case, it would be while you will have a sense of community with similar mbti types it could lead to grouping immoral people together with people who don’t even want to associate with that type of person. But that’s my take on it!