Boyfriends earrings

My boyfriend has two studs in his ears. He got them a while ago and I’m not the biggest fan. I never said anything because I know he likes them but they do bother me. I asked him what he liked about them and he kind of caught on to what I was hinting at. I feel bad. I don’t really know how else to bring up I’m not a fan. It’s not a deal breaker for me but I just don’t get why guys wear earrings