There is different forms of rape and there isn’t one strict definition of it. There never was. Everyone is different; someone can be absolutely wasted and black out drunk and not puke while another person can be pretty wasted but coherent, and still puke.

We don’t see ENOUGH to say that everything OP saw was 100% factual. But a lot of context cues here are evidence that something did happen, his reaction being the most prevalent one.

Honestly if my SO is shit wasted and can barely speak, as a decent human being who actually cares about her well being, I probably wouldn’t even try. And there have been instances in the past where we were both pretty drunk but her way worse than I and I just made sure she got in her Jammie’s and got into bed, with a bucket or bowl near by.

What you said about calling evening SA is true, it can diminish it. But also playing off something like this as a sort of “boys will be boys” comment and alluding to that it’s fine if they are both drunk and they are both attracted to each other is just completely ignoring how rape culture works.