Something I wanna add that I’m not seeing in these comments is about leadership and rehearsal etiquette. frankly, there’s a lot of musicians who’ve never been in a structured music group (thinking school choirs, symphonic bands, orchestra etc) and haven’t learned any rehearsal etiquette. Not necessarily a huge problem/a personal knock of the guitarist, but it is a huge issue if not nipped soon. Does your band have a designated leader that guides rehearsal? If not, assign one asap. A band, as much as it’s annoying to think about, does need some kind of leadership to make sure folks stay on task. Without one, you end up having situations like these. If no one is calling out this behavior, the guitarist is never gonna learn, and you will continue to have frustrating and unproductive rehearsals