[Marvelous]

...and hateful trolls posted slurs, jokes and comments against minorities and social groups of people (i.e. Jews, Blacks, Gays and even Women).

Pretty much any *chan site is a haven for the scum of society.
The dodgy links and general trollfest puts me off visiting them. Still, about once a year or so, you do get the occasional gem surfacing among the trash if you don't mind losing a lot of faith in humanity while searching...

5 sites came to me about where Mpreg and Transgender pregnancies (Trans men are real, Trans women are mock) can be discussed (esp we're the main place for gender-bending the pregnancy experience, the most socially liberal one can get).
1. Preggophilia (center-liberal environment, more focused on FPreg).
2. BarefootandPregnant (conservative, yet Libertarian and some female members' leniency towards Mpreg and LGBT identities).
and 3. Pregchan (However, it has Alt-right and far Left trolling, looked at the Anne Frank pregnancy and Corona-Chan memes).
Avoid 4chan (despite preggophilia, female POV and MPreg discussions, memes and images get interrupted by arch-conservatives).