If the hearing impaired can't hear it, how can it be offensive? On the other hand, if they suffer only partial hearing loss, and actually hear it, they can rejoice and respond by saying "Yes, yes, I do!"
As far as schizophrenics, if they hear what I hear then they can be happy that they are having a good day. If they hear something else, then they know it's time for their meds.
Sounds like a great song for everyone!