They refused service to my parents, my wife and me as well, and 3 out of the four of us are liberal as hell. Of course, we were in shorts. Was she in shorts? Maybe it wasn't politically motivated at all. Maybe they just don't want to seat tourist rubes in shorts.
She couldn't have been in shorts. If she had been wearing them, there would have been EMTs treating people for the hysterical blindness she caused.