The problem comes up when astrology people start arrogantly analyzing your personality based on that shit, come to a negative opinion of you based on that, arrogantly roll their eyes and pout and smirk at the fact that you obviously are such a libra/whatever by obviously not believing it, and then spouting that utter nonsense to people around you. They are actively essentializing people and shaping their behaviour with them according to literal insanity.

Astrology should not be allowed to be published by public book publishers of any kind in a socialist society. If people want to believe insane bullshit in the privacy of their appartments, that's their problem. But the moment you start trying to spread those beliefs and use economic resources to do so in a way that can undermine people respect for scientific thought then that's definitely a problem.

I'm sorry but it's basically just phrenology for hippies.