I don't have a strong sense of what's mainstream because I usually only engage with politics in a left-leaning online space that was popularized by a protest against a corporation. Can you think of anything mainstream that's likely to get a pass? I'm 80% sure if you can, it's going to be because someone will see it and not even consider that it could cause an argument because it's such a given... I'll drop that down to 50% if you're trying to pick an example to prove me wrong.