Quite frequently we are privy to attitudes being for or against inclusive education. There are different reasons why this occur. I can recall one case where a teacher was removed from one class which she prepares for  entrance to another school  to another class where she had limited practice and I think unbeknownst  to her she kept at the same pace and used the similar strategy she would've used with the previous class.
 As a result, one particular child made a comment that this class is to high  and the teacher's method was not allowing the opportunity to learn what was being taught.
At that point I suggest the teacher should've observed and research the class she was afforded and created a space to target the needs of the children she was afforded. The particular child did in fact have an intellectual impairment.