when you see them contributing to rape culture

What, the grand total of zero times? I don't go to bars or clubs, I don't go to parties where there are an appreciable number of people I don't know. The social contexts in which I do interact with people I'm not close to are either in-passing where there's no way to make that assessment, or professional, in which case we're both under considerable social constraints and such behaviour is not likely to arise even from someone with such predilections. Yes, I realise that last sentence is spoken from a position of privilege, and that behaviour does arise and is a problem for those targeted by it, but it's outside my scope of awareness and I'm not going to interrogate my coworkers on the off chance it has happened.

I'm willing to accept that maybe back in highschool I wasn't as aware of these issues and may have let an instance slide here or there, but even if I did recall such an event that was more than two decades ago, and I'm not going to hunt down someone I haven't seen in twenty years to admonish them after the fact.

Though come to think of it, there was one instance of it in an online chat within the past few years, and I did say something, which led to them basically flying off the handle and getting kicked from the server, so there's that at least. I guess I'm one for one?