Yes they know, and hardly care. Sometimes they like to talk about it with random people, which can sometimes be a little aqward...
But you know, I don't really care all that much anyway what people think...
Haha! true! Very true!
I'd ALWAYS mess up with my posture and the way I'd hold my bow when I first started! I'd mess up at least once doing something like that every single practice session for the first year or so! Hahaha! Man...