This will come as little condolence to the previous posters, but the rude, stupid people are just as annoying to those of us waiting for service. There's nothing like waiting for service while someone is vehemently arguing some point that they have no chance of winning. My personal favorites are the people who miss getting to their flight before the cabin door shuts.
A word to the clueless...that isn't an argument you're going to win--GUARANTEED.
I think Henry Rollins put it best (and I paraphrase)..
"It's like these people are killing your life a few seconds at a time..."