I have an experience with them myself I shared in this thread. The simple answer is its conservative small town America having a shitty attitude towards children in general that ranges from "I know better than you, shut up!" to "Well if you went in there, clearly you deserved it!". Never mind the fact that frequently are autistic children and children with other mental disabilities are frequently classified as "troubled".

If you want to truly hate these schools, read the comment I linked above.