If I see concerning behavior, I feel the need to say something because it's concerning. More girls will be embarrassed, more people could be exploited, it's not ok. I feel like seeing that, knowing you can do something, and choosing not to is pretty close to condoning it. It's not about friend group politics; there are people outside the friend group who are being passed around in that without their knowledge or consent, and that's not ok. I wouldn't care if it was just guys with dark memes.

Doing literally nothing when you see shitty behavior is almost as bad as the shitty behavior itself. Stop letting people you know get away with being pieces of shit - call them out. Ignoring it simply enables more people to ignore it, and the behavior slowly becomes more and more socially acceptable.