Absolutist claims like “Jokes about hate speech are dark humour therefore by censoring them you are censoring all dark humour” or equivalent will be eaten with prejudice.
There are… other… places on the internet you are welcome to visit if you wish to share in-jokes that make light of genocide, racism, or general bigotry, or attempts to defend those actions as appropriate, even in the context of humour. Our community guidelines are clear on those points.
EDIT: More here.