Astrology is fun if you don’t take it seriously.

I agree, but the problem is that a lot of people do take it seriously. It's perfectly fine to enjoy these things if you just think they're fun. But actually believing in things that are demonstrably wrong is definitely a huge red flag for me. I've also become extremely negative towards astrology in particular because I've had to deal with family who used to take it at face value and also because I love astronomy, which, to me, gets tainted by this pseudoscience nonsense that sort of imitates it.