Sorry I can't take things seriously that come from South Park.
I am not totally against horror as you can tell, although I think that senceless murdering or murdering for fun is too fucked up. There are scenes like in The Golden Circle 2 and 1 that are pretty terrible, for example, but still not as bad as scenes from 18+ shows. You have to decide on your own. I much rather watch this than that.
The only real 18+ movies/series I have watched are 300, Doom and some movies of the series Ip Man, which is an amazing story btw. (Ip Man is based of true events). Then I watched Love, Death&Robots and Castlevania. That's all, I think. (Castlevania is 18+ though...) Maybe I forgot something, idk.
I watched Alien Covenant which isn't 18+ but still terrifying.
I still have to watch the other Purge movies and also Death Note the Netflix original movie (not the anime series).
Zombieland was one of the best movies I've watched, it's so very well done and need sequels, for sure.
In my opinion you can still enjoy different genres of movies/series. Anime or Animations or Nature Documentations, Crime, etc.
Your dad really did this? Awful, well my dad beat (hit) my ass when I was younger... not very nice either. I would say my parents are relatively old or average, compared to other parents.