Going to WDW as a family of adults (I'm 28, mama is 48, and auntie is 58) we have experienced our share of rudeness - several times at character meals we've recieved the snide comment "huh, I thought Disney World is for kids." We just brush it off, no use getting into it with idiots.
The rudest was at the Little Mermaid show, oh gosh I think it was in 2006? Anyhow, that year I was pushing auntie in a wheelchair, her knees are too bad for all the walking, and after a difficult (medically speaking) spring, she was not up to using a
ECV, so I had been pushing. So, at the Little Mermaid we get seated in the last row for wheelchairs and take our seats and so does the rest of the audience. After the lights go down and the Mermaid takes the stage, this 13-year-old boy in front of us decides to sit on the back of his seat - keep in mind this kid is already taller than I am - and is now blocking my entire view. I lean up and ask very nicely to please sit down I can't see. He ignores me, so I ask again a little louder. With that his mother turns around and yells "SO? He likes the Mermaid! If you want to see, you can just stand up!!" I yell back at her "I've been pushing a wheelchair in 90 degrees heat outside, I need to sit and so does your son!" She then says "Its not my problem your family is too fat to walk around the park, stand up or shut up!" I was in tears at this point, and my mama wanted to get a CM, and I told her not to, but in hindsight I should have let her. But near the finale, I did give the chair a good swift kick and the kid finally sat down. As they were exiting the kid says "Your really mean you know?" and I said "Yeah, and you're really rude!!!" Needless to say that was our last time in the MGM park, we had more rude encounters there than at any other Disney park, and that one took the cake for sure.