How would you feel

A lot of the time when I’m at my bfs house and we’re around his parents ( more so his dad) he always makes some sort of sexual joke. Like about us having sex or in that nature. About a week ago he made a joke about my boobs and I really didn’t like it. I mentioned it to my boyfriend and he seemed pissed off at me. I hate being around his parents they make me uncomfortable. And the thing I find funny is that they’re so protected over his sisters and i know they would lose their mind if someone made that kind of joke with them, but for me it’s ok??