AITAH for refusing to go to my boyfriend's friend's wedding because I find his behaviour disrespectful?

I (31M) have a boyfriend (38M). He has a friend I'll call Dan (47M), whom I met for the first time last weekend.

Dan and another friend were visiting, and my boyfriend invited me to join them for dinner and a street event afterwards.

During dinner, I already felt pretty uncomfortable and left out. They were mostly talking amongst themselves, making inside jokes and talking about people and things I didn't know. Dan especially barely spoke to me at all. I tried not to take it personally, stayed polite, and brushed it off.

Later, after we'd had a few drinks and went to the street event, Dan suddenly started engaging with me. However, the things he said made me really uncomfortable. He started telling me that he used to have a thing for my boyfriend, that he had my boyfriend as his screensaver, and made jokes about masturbating to him.

I was honestly caught off guard, so I just awkwardly smiled and didn't really respond.

Earlier that evening, Dan had announced that he was getting married to his partner next year. He then said to my boyfriend, in front of me, something along the lines of: "Your boyfriend is invited too, by the way, if you're still together."

I thought it was a weird joke, but I tried to brush it off.

We saw Dan again two days later for drinks. My boyfriend mentioned that he's going to Colombia for a few weeks, and Dan said something like: "Well, you won't be able to fuck anyone because you have a boyfriend now." Again, this was said directly in front of me.

After that, I told my boyfriend that I really don't like Dan. I genuinely get along with and like all of my boyfriend's other friends, so this isn't about me disliking his social circle. It's specifically Dan.

I also told my boyfriend that I don't want to attend Dan's wedding.

My boyfriend said that's okay, but he seemed upset and doesn't really understand why I feel so strongly about it. He says that this is simply Dan's sense of humour and that he doesn't mean anything by it.

I'm not asking my boyfriend to stop being friends with Dan, and I'm not asking him not to attend the wedding. He can maintain whatever friendship he wants with him. I just don't want to spend my time or money attending the wedding of someone whose behaviour towards me has made me repeatedly uncomfortable.

My boyfriend seems to think I'm taking a few jokes too seriously, while I feel there's a difference between having a crude sense of humour and repeatedly making sexual comments about someone's partner, making jokes about their relationship potentially ending, and barely acknowledging that partner otherwise especially when this was literally the first time meeting them.

So, AITA for refusing to attend his friend's wedding because of this?