My best friend and his new girlfriend are excessively affectionate in public, so much so that many of our friends are uncomfortable with hanging out with them. One instance of their excessive PDA is when 9 of us were having brunch, and they were kissing (and really going at it) while we were waiting for food. In a smaller group, they are slightly more tolerable but still try and sneak in a few kisses when the rest of us aren't looking.

One of my other friends approached them about their PDA in public, and the girlfriend snapped back that it's not her fault that he doesn't know how to show affection to his girlfriend. I have brought the PDA issue up with my best friend casually, and he plays it off as not a big deal. I did not push the issue because he is well aware of the group's concern.

For my birthday in September, I want to go interstate with 2 other couples (not including them) for the weekend to celebrate. I don't really want them there. They would know about the trip, and they will probably be upset and think I'm the asshole for not inviting them.