I'm somewhere in the middle between relaxed and serious. I like a bit of fun banter in the foursome, swearing doesn't bother me, don't mind a little talking/noise (as long as it isn't loud or sharp right in my backswing). Sometimes I'll drop a club after my follow through after a particularly bad shot (but never throw one). Ready golf should be must-play for most courses.
However, for some reason walking on my line really bothers me. I can't explain why - it's not even that your spike mark is going to bother my ball (might actually make it better). Also, don't be a close talker. That isn't really golf-specific, more life in general.