Some of that has to do with stage manners. I was on stage with a fellow at an 'open mike'; he'd asked to 'back' me. Anyway, he decided it would be a good time to show off his facial expressions and some guitar work that had lotsa flash but didn't really complement the song I was singing. Long story short, when we finished the song I leaned over to him (and he to me). I whispered, "Get the fu#k off my stage or I'll punch your lites out." He left and we haven't spoken since. Been 35 years.