Meanwhile, Facebook and TV stations censor nipples and four-letter words. Can someone explain this double morals to me?
Hate speech laws would be involuntary. You could not opt out and there would be a threat of force if you should fail to behave as demanded. Worse still... who gets to define what "hate speech" is and when the use of force gets called in?
It's legal for Facebook to say what it wants, and it's legal for Facebook to never say anything that it doesn't want to be said.
It's legal to make your own Facebook with nipples, four-letter words, blackjack and hookers; and it's legal for Facebook to forbid any posts containing letter x if they so choose.
AFAIK it's not - youth protection regulation gone wild is enshrined in law at least for TV stations and I'm sure that if FB wouldn't fear angry mothers with "uuuuuh buuuh my 16-year-old-boy saw a naked boob on FB" they wouldn't give a damn about boobs.