It is. But... you're actually going to want help from them, so trolling them might not be in your best interest.

A related maxim: "Never be rude to an airline gate agent."

A related related maxim: "Someone who is nice to you but rude to the waiter is not a nice person."

Or any support person for that matter. What baffles me is people who think having a terrible attitude can get them what they want. The support person either has lee-way or not, and if they do, they probably will be less likely to help you if you're an asshole.