Will someone PLEASE tell FIL...

[Dilbertian]

... to adjust his hearing aids? They are squealing and warbling like a flock of seagulls, and everybody is pussyfooting around him, pretending they cannot hear it.

Argh!

You tell him

Why can’t you do it?

He can't hear me. Can't or won't - same difference, in his case. He's liable to leave them like that purely because he knows it bothers me.