I wore hearing aids everyday to that awful store. I can speak very well that most hearing people assume I am an foreign exchange student. Being hard of hearing is HARDER than being either Deaf or Hearing. When I speak, the hearing people automatically think I can hear everything they say. After I gave up my hearing aids and started learning ASL so I could have an interpreter at my appointments and classes, I still get attitude from the hearing coworkers whenever I asked for an interpreter since they already know I can speak well. When I try to work with Deaf people and they find out I can speak well, I get shit from them that I am "think-Hearie". That's why I speak less and less, signing more and more. I would rather work with Deaf employees than hearing ones because of the communication and the Deaf people's willingness to try communicate more. I rarely meet any hearing people on the job who try to go the extra mile to make sure I understood on the job.
Tell the professor he is politically incorrect for using the "hearing-impaired" term.