I have been going to WDW since I was 5. Even though I loved the ride, I would always feel bad when we got to that scene. Ironically, not because the women were being sold, although as a adult I find that objectionable. Even as a young girl, I looked more like the overweight woman in blue than the redhead. I got to watch a scene with men who didn't want her. She wasn't worth anything to them because she wasn't beautiful. And I was like her. I wanted to be the redhead so that I would be wanted as much as she was. That's what's so sick about that scene for me. I wanted to be the one they wanted to abuse, because otherwise I was worthless. This is not a static history lesson. It teaches girls how to feel about themselves. It teaches boys that it's ok to judge women based on their appearance and their sexual use.
I too always felt uncomfortable with this scene - for some of the same reasons you point out, and also for the fact that selling people was being portrayed as something jokey. This was long before the #metoo movement. Believe me, I happen to think that in many cases we have gotten pretty carried away with political correctness, but I think there is a difference between PC and being in poor taste, and this scene to me was always just inappropriate. I know all people don't see it that way but that has been my view of it since my first visit several years ago.
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. I agree with Pete that the world today is being ruined by all this PC rubbish. As the old saying goes "you can't please all of the people all of the time" - if you don't like it then don't go.