Boyfriend’s Group Chats

my boyfriend is in a few group chats with his “best friends,” who he has known since grade school. some of them are single and some of them are married or engaged. there are guys sending in pictures of girls ALL the time into the group text, and recently have been sending nudes of girls. my boyfriend does not respond to any of it and lets me delete it right away if it comes through and we’re together, but it still bothers me. he says “guys will just be guys. i’m not the one sending anything or saying anything.” it’s not just the pictures, but the way they talk about these girls that’s disgusting. am i wrong for being upset with this?!