He could have politely asked for the supervisor to start vs being a belligerent asshole until one showed up. Alternate take though, if he was nice and asked for a supervisor to start and the person told him no and they wouldn't get a supervisor - well that's when you have to actually be the asshole and make enough of a scene one shows up.

That's like ... Very unlikely though, most people will get you their higher up person if it's necessary to help and you're being nice.

I hate when you have to be the jerk to get what you need but sometimes you just have to.