The leper is always at the gate of the church - never inside. What is really happening is that we are all communicating our negative response to difference. We are saying that anything or anybody who is different from our accepted ideas of who should be part a particular group should be excluded, mocked and criticized. The promotion of negative images is not the only oppressive communication technique. The more firmly we believe in the particular group that we come from or support the better we become at communicating in a way that makes people who are different unable to hear or understand what we are saying.
Professionals are particularly good at that sort of communication trick.
Whatever the profession, they gather words around them that only they know and for which most other people use much simpler words. This is quite understandable when they are communicating among themselves. A scientist would be expected to communicate to another scientist in their professional language but when they are communicating - then they use this scientific language to disempower. Because disabled people have to see many professionals in the course of their lives, this linguistic oppression is a common factor in communication. Most people have gone to a doctor or a lawyer and wondered what they were saying because they used a word which we did not understand.