Boyfriends Friends

My boyfriends friends are not the nicest people, stuck up , childish, and do drugs and just not people I think my boyfriend should be hanging out with. I was over at my boyfriends house tonight and we were having a good time just the two of us watching movies because I haven't seen him in two weeks since I work and one of his friends showed up randomly without even calling and I was upset. Honestly, idek how to explain how I feel to him I've said everything and he can't understand and think they are fine.