So, I didn't talk to the guitarist about his message, mainly because he refused to talk to me. He said two words to me all night, and ignored me on stage. I talked to the rest of the guys, and once they heard my side of the story, they all agreed that I was in the right and the guitarist was being a dick. So, the drama continues. Maybe he'll behave next time, maybe not. Once the calendar frees up, I'll evaluate the situation and maybe quit if the BS continues.