Well, I'm bi so I make jokes about my sexuality and so does my family. The son had no issue with it. I thought the jokes were lame, personally, but they weren't offensive or anything.
I think something that gets firgotten by people who've watched this kovie is that this wasn't everyone's first time interacting with Meredith. The sister had met her before, which clearly didn't go much better than the Christmas visit, and one of the brithers had spoken to her. Both oretty much described her as stuck-up, which she was. That's literally how her character is written and is the point of the movie. One of the opening scenes is her demanding someone stay at work to send her something even though it's the friday before Christmas ("I don't care if it's Christmas!"). So she was already unpopular with almost half the family. Then immediately upon entering the house and meeting the deaf son she shouts at him. Which isn't just ignorance, though it's also that and rude. By the time they got to the dinner pretty much everyone in the family was annoyed by her, not without reason. Then she went and really put her foot in it at dinner.
Yeah, they were visibly annoyed by her being stuck up and did not try at all to hide it. And each was annoying in his or her own way. I just...cannot find it in me to see Meredith as the injured party.