I'm late deafened, but not mute. One of my ex-bosses was a really nasty man. One day, someone called me on the job, and my boss told him "she's deaf and mute", you can't talk to her", and hung up.
The next day, I asked my friend why he did not call to let me know the news (something important), and he told me what my boss had said. I was enranged!....I confronted my boss about it, and he replied, "well, I didn't know you could hear on the phone."! I said, "I can't, but whenever someone calls for me, someone takes a message for me." And "I'm deaf, but I'm not mute, as I'm standing before you telling you this". His face was "RED".....
All employees were allowed 3 minutes on the phone. Very seldom did I get a phone call! And my boss made me feel as if I was not entitled to a phone call.
The same boss told a gay man that was hired...."If you would stop taking it in the rear, you would be alright." And he quit working there!
I've no qualms with the word "mute". If I was mute, that means I can't talk. But for some people to "think" that a deaf/mute person is the same as "dumb"....that raises the hair on my head! And I'm quick to defend that. I've met some really "hearing and dumb" people in my life. And they have all their facilities, no reason for them to be dumb!