There's a large part of me that thinks, that as a 30yo white male, I should keep out of this. However as the dad of two daughters I want to call you on that.
Saying something is ok under the pretence of humor doesn't validate it or diminish its inappropriatness. It's the most common defence to, but no different to a bully saying 'Its ok, I was only joking, lighten up!'
Now, most of these were posted long enough ago that there probably is a valid 'historical context' argument that can be made, given repidly changing attitudes but that's the argument, not that's it's a joke.
Just my $0.02...