None of these people make very much money, and you have no idea what or who that bartender had to deal with prior to your encounter. I wouldn't have been happy in your shoes, but I think running to the manager and making a stink was as much of an overreaction as hers was to your very inflexible drink request. (A drink request which I find revolting FWIW.) Perhaps laughing along and having a little understanding would have made for a better outcome for everyone concerned. It sounds like she had plenty of other satisfied customers.