Is this normal for guys to do or ?

My bf always has at least one hand in his pants by his dick. When my friend (girl) came over one time he was wearing basketball shorts and had his hand like that and it made me very uncomfortable ‘cause it was out in the open and noticeable. He says he does that everywhere but idk. Is that normal for them to do? I’ve never seen my ex’s do that let alone any other guy.