So last weekend my best friend had his 30th Birthday party at his family's beach house (massive mansion is a better term). He invited about 25 people to come over to celebrate/sleep over. The house has a heated pool and a hot tub, so we brought swimsuits. 

Most of the attendees are close friends of mine. My girlfriend of nearly 2 years has met many of them on multiple occasions. They're all super nice, respectful, &amp; intelligent adults...but, this group does like to have fun. In the past my gf has been uncomfortable in certain situations she isn't as used to as I am, so I explained to her what she might encounter at this party. I warned that things like people getting naked in the pool and MDMA use were a possibility. 

 I said if she wasn't comfortable she didn't have to come. But if she did go, as I rarely get to see these friends, I just wanted to enjoy the party without worrying about her being offended by everything. She promised that she would be fine and wouldn't start any arguments.

We get to the party, everyone has a great time. Some people do end up rolling but its mostly pretty tame. Around 12am I tell her I want to go in the hot tub. She didn't really want to go in, so I suggested I could just go in without her.

Thats when she says: "if theres half naked girls in there you're not getting in". I protested, its just my friends in the hot tub. And if people want to get naked thats on them, we're all adults.  To which she responded, "I don't want you perving on any naked girls. If you respected me you wouldn't go in". I assured her I wouldn't be "perving" and didn't see the big deal. She was welcome to join, and should trust me regardless of whose in there. (To be clear, nobody was actually naked). She then got upset and went into the bedroom alone. She later changing her mind and went in the hot tub with me (probably to "babysit" me)

This isn't the first time we've had a hot tub disagreement. About a year ago with friends on a ski trip, some of the girls didn't have suits so they just went in in their bra/thongs. Nobody else cared. But my gf started shooting daggers at me and was angry the rest of the night. She later told me "that was so inappropriate, those girls have no respect doing that around people's boyfriends". I disagreed, which sparked an argument.

Also later at the 30th bday, a bunch of us were talking in one of the bedrooms. Two of the girls (who are bi) started playfully kissing each other on the bed. I glanced over but didn't stare or anything. My gf gave me an angry look and said "what do you think you're doing?". I was confused. "You're really not going to look away?". She walked off upset.

AITA for not finding these things disrespectful?

To preface...she's always known I had a bit more of an "alternative lifestyle" during/post (lots of music festivals, burning man, psychedelics, etc). I was always open with her about my liberal views &amp; experiences. Shes always *claimed* to accept that about me.
