Maybe morally, but in practical terms that's not really contradiction. People on The Internet are thoroughly desensitized to the moral impact of things like that. Almost no one complains when we laugh at violent comedies, despite the fact that we all know murder is bad. There are a few more noises about Game of Thrones, but it's still extremely popular. Why are a few racist/sexist/etc jokes on r/funny any different? If you want to throw those out, you pretty much also have to throw out the other 95% of popular culture that derives entertainment from bad behavior. Of course that's what we fundamentalist Christians have been saying for about a millennium, but of course no one listened.