Maybe I shouldn't be so sensitive, but something that just gets under my skin, and riles the bejeezes out of me, is customers who when they go to a restaurant, treat the waitstaff, like the slaves from 'roots'. Servers are not slaves, even if they only get minimum wage. I am really passionate about this, when you go to a restaurant you should at least treat your server with respect, that's my rule of thumb, if they dissrespect you then you can play their game. But you don't just go into a restaurant and get all slavemaster on the waitstaff, demanding this that and the other and 'it better not take too long'. And you don't call the manager the next day to have the server fired because they brought you tea instead of coffee, ( you get the drink mix up fixed on the spot). My friend actually did that, she called a place the next day to have a server fired because he forgot to take her drink order immediatley.
That's my rant for now, thanks for listening.