Where can I post anonymous racist, sexist, and homophobic rants when Yahoo Answers shuts down?

On the door to your mom's basement. Until she makes you move out. 

mensa,org is a good place for discussing stuff like that.

You'll still be able to post racist stuff, as long as the racism is directed towards White people and the sexism is directed towards men, and the bigotry is directed towards straight "cis" persons.  And you can even do that right out in public as happens so often today.  No repercussions, no cancelling, it's all politically correct.

And there's the sad thing here.  When the very terms of bigotry are defined by one extremist ideological camp that uses critical theory, and the Establishment media panders to that ideology, creating division and resentment among all the common people.

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Well, Facebook doesn't let you go anon, so you are chit out of luck there. 

Waltdisneyworld.com

Expand your horizons.