boyfriends friends suck...

Kira
Alrighty so my boyfriend has mostly amazing friends. But there is one friend who I absolutely do not vibe with, he has a gf who I also absolutely do no vibe with either. 
My bf and do mostly everything together, and he often wants me to hang out with them. I feel bad saying no, but I've given them so many chances that it's not even worth the struggle. I've told him about how I feel about them but he continues to want me to come when they hang out. 
Any ideas of how to approach this?