Some teachers, especially older ones, don’t think that they should have to work with special ed kids, and actually do everything in their power to keep the special ed kids out of their classes.
When my daughter was in Jr. High, their was a down’s syndrome girl, who had been placed in choir to provide some interaction with the other kids. The night of the concert, the girl showed up, dressed properly and so proud that she had memorized all the words to the songs. My daughter walked into the room where the choir had been preparing before going on stage to find the Down’s syndrome girl in tears. She told my daughter that the teacher told her that she could not go on stage with the rest of the choir.
I feel for the Down's Syndrome child, but that's not the only kind of special ed kid. Kids get put in special ed often for having massive emotional problems. Specifically, they can be VERY aggressive, and very disruptive. I've had some extremely difficult and borderline dangerous kids put in my class. You don't know what it's like.