if he was insulting the audience, then yes i agree. but it was banter with a college and friend he has known for years. no one had any right to get involved and be offended on Riley's behalf, it's between him and Linus, both of who know it's a joke. how people perceive it doesn't matter, because it doesnt effect anyone but those two.
"microaggressions" and outrage culture is the most annoying thing on the internet these days.