My noise deafness is bad enough that on initial Class 1 I got a letter from Dr Ruth? at the dept advising me to consider a career outside aviation. Skip forward a quarter of a century and a phone call to a Dr in Canberra got the response "well you can hear me can't you?".
As mentioned modern radios/intercoms have a knob(s) which fixes the problem
On the positive side noise deafness affects mainly the frequencies of:
- angry adult female
- screaming babies/kids
- wife talking about an expensive thing that (from the pictures) goes in the ear and uses batteries