Moral relativism is just a silly trick to justify this. Its a cover to hide their cultural Marxist hate ideology. When a Black man sings about raping women they call it art. Its why Muslims that throw gays from roof tops are anti imperialist freedom fighters, but WIG men who make the slightest complaint about the Gay agenda are to be hounded out of their college their jobs their society. When Muslims massacre innocent White people lefties are terrified. Terrified that someone might be slighly impolite to a Muslim. Even while these terror attacks are still underway lefties are not worred about the Infields dying but about possible anti Muslim reactions.
If these lying leftie hypocrites really followed the moral relativism that they pretend to, they wouldn't be able to criticise Christianity, neo Confederates or even Neo Nazis.