@Glisten , I know because I've seen people do this.  All too easily people confuse disability with inability.  Even people with learning disabilities are able to learn, all human beings have survived partly by learning.  So the barrier isn't the disability, it's the lack of interest in finding the way they learn, which is the way to develop their own neural pathways for studyiing; and everyone's neural pathways are different from everyone else's.

Part of being a good teacher is being flexible to your students' learning needs without sacrificing the quality of your services. 

However because teachers are also human beings, we're also lazy, so when we see someone with a disability we don't see an opportunity to develop our skills as teachers we just see someone who doesn't fit "the formula". 

There's a saying we used to say in the 70s "There are lots of ways to skin a cat". It means think outside the box, that student's neural pathways are theirs, not yours, our job as their teachers is to help them develop their learning skills, their methods and themselves, not our resumés.

We become better teachers by teaching people who push our boundaries and make us question why we have them.  Pedagogy, the art of teaching, is a very interesting subject and there ate people specialise in it