Do mentally challenged people know that they are mentally challeneged?

I think there are different degrees of Down's syndrome. Some might not know any better, but I'd guess that most of them know they are different. Just because they're slower than the rest of us doesn't mean they can't think.

I have worked with people who are mentally challenged, and it is my experience that mentally challenged people have feelings and thoughts just like other people. They aren't happy all the time, they get happy, sad, angry etc just like other people do, but sometimes the things that make them happy or sad are different from the things that make others happy or sad. Some years ago I worked in a home the mentally challenged, and one day I went to a concert with a group of the residents. The singers were telling jokes between the songs, and the jokes were about mentally challenged people. Some of the residents were very upset when they heard those "jokes" and others didn't understand them. I was very angry when I heard the so-called jokes and I lost my respect for the singers, but that's another story. My conclusion is that some people are aware that they are mentally challenged and get sad and annoyed when they can't learn things as fast as others, but other mentally challenged people are not aware that they are different.