I liked your answer so freaking much.
From my experience there is very little headbutting at gyms. I've been a member of 3-4 different gyms and people are usually pretty respectful / helpful. I've only once seen some meathead guy get into an argument with a member of the staff.
If you're there to improve your health then you get kudos and respect from me, if you're there taking up space and sitting on a machine that I want I may just ask you to move.