I agree with this poster
I also have no issues with people who can't hear. Often if someone is listening to music or has sound off due to family members sleeping or whatever they will announce it as soon as they join a quest. "hey, I'm going to be playing with my sound off so please type anything relevant."
Some group leaders will specify "must be able to hear" in the lfm. I do think that people should take into consideration those who are hearing impaired but unfortunately not all party leaders are kind considerate people.