Are surprise strippers a bit of fun, or harrassment?

The other night, I was in a bar, and at the next table was a group of young women. They were dressed up, and it turned out it was one girl’s birthday. We figured this out because somebody, I assume her friends, had hired this guy to turn up and do a whole number on her. It was a basic strip session during which everything came off, including underwear, and this young woman whose birthday it was was relentlessly and aggressively groped. She looked constantly embarrassed and freaked out as he was grinding against her and shoving his hand up her skirt, but she was trying to go along with it. The entire place was loving it too, cheering all the action on. I was torn between finding the spectacle funny along with everyone else, and extreme discomfort at her predicament. It could not have been clearer that she had no choice in the matter. I’m sure some reading this will say, ‘of course she did, she could have just objected.’ But having seen it, I could see that that would be incredibly difficult, if not impossible, with her friends looking on having paid for the whole thing, and everyone else cheering and egging things on. Plus, the music was much too loud for anyone to be heard over it. What seems most disturbing is how the whole thing was so dressed up as ‘comedy’ and was so frankly silly (the stupid costume and music) that if she had objected to it she would have been seen as having no sense of fun, and branded as a killjoy, a spoilsport, or immature. Really, I wonder how she got through it. I can’t imagine what fun there is in hiring somebody to come and harrass another person in front of a barful of people, except as a form of cruel amusement for everyone who isn’t the one being harrassed. What do people think?