Horoscope is just a little fun. Myers Briggs has a massive community and it helps others understand others better. Is is perfect? Of course not. But it provides a framework that works for majority of people.
Horoscope is not even close to that. If you have a look at forums where people discuss Myers Briggs types they go very sophisticated in depth. It actually has created real discussions between people.
There are horoscope forums and huge community claiming it helped them understand too. Personality psychologists regard MBTI as useless in describing personality. I provided literature on that in my article, but I guess further discussion is pointless.
Tacky pretentious middle class psychologists sure. But who cares about the middle class anyway. They are boring and don't like change or nuance. They lack a good taste of life.