If those same comedians woke up in the 1980s or 1960s they would still be booed out of venues. They aren't funny. Just not fucking funny at all. Hell even if they went back in time to the 1920s when blackface was 'normal' they would still not be popular since all they would do is make racist jokes for the sake of racism and audiences would not be amused. Not because they wouldn't be racist, but because the jokes just suck.