I'm nice as pie,to all the authorities I don't get involved with ruskys or German, but talk with a few at the local, that I've known for years, all good .Never had problems with bar girls, hardly go to those bars,but if I do it's all fun and joking.
People seem to go to bad bars and get scammed then turn angry, they are stupid to get angry they should call the tourist police and calmly sort it, every knew tourist should have that number on their phone and get a crash course in bar scamming b4 they leave for Los, if they are going to go looking at these sorts of venue's. My first visit to Germany when I was younger and at sea, we were warned by experienced crew to not let girls sit at your table and don't buy them drinks.