Okay so this happend quite recently. I'm with a group of friends with which we hang out quite often. When two of the members of these group get tipsy they like to have sex with each other which is accepted by everyone (not that it should matter because it's their own choice and body). 

However last weekend we had a group outing that ended with unexpected drinks at the home of one of the two friends, since I drove there (and 2 other people drove with me) I couldn't drive back. Because I have a zero tolerance policy  on driving drunk. So I asked if we could stay over (she has the room for it). She said it would be okay so we setup an air mattress and stuff. Because there now longer is a time limit on the evening we keep drinking and hanging out smoking some weed. 

At this moment I see signs that usually start when these two above mentioned friends do their thing. And me being drunk (although I'm quite sure I would've said this even when sober). Could you please keep it in your pants for one evening and let us all have some decent sleep. This because even though she has room for a the 4 of us her bedroom doesn't have a door (it's on a weird floor layout) and the apartment is quite noisy

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Which they didn't take too kindly and got mad at me the host telling me that it's her house and she'll do whatever she damn well pleases. The guy to drunk and high doesn't really say anything. This leads into a small argument where I tell her it's fine that you wanna fuck him I just don't wanna hear it when I'm trying to sleep. To which she responds then why did you stay. I "tell" her that she knows why and it's a stupid response. Eventually things kinda settle down due to another guy pooring new drinks and challenging me and the other guy to a chug contest, which kinda gets the party mood back on track. 

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We all go to sleep and because the argument must've taken away some of the sexual tension I got a good night's sleep. The day after she texts me that she didn't like the way I acted and I reply that I just voiced my opinion and wanted to get some sleep.

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Am I the asshole here