Worst experience with paintballers I've had would be after a mil-sim, myself and two friends were just chillin' relaxin' all cool in the parking lot when some dickmouth from a paintball game that was the next day decided it'd be fun to throw a smoke grenade at us and scream, "WELCOME TO REAL GUNS."
Real paintball guns.
However we were talking to others who were attending that same game who seemed to be very interested in the stuff we had. I agree, paintballers on the whole don't exactly project an image of maturity, though thank god those guys are still a marginal demographic... I hope.
But yeah, they're two different games, and no one's better than the other. Though Airsoft is really my cup of tea.