I don't blame your father-in-law: We live in an increasingly loud world, where people casually make sounds above the threshold of pain. I just started carrying earplugs in my pocket for this reason.
More recently: I've been in movie theaters where the dialog is played over the threshold of pain, and on a cruise where the microphone for a drawing clinic was set over the threshold of pain.
More recently: I've been in movie theaters where the dialog is played over the threshold of pain, and on a cruise where the microphone for a drawing clinic was set over the threshold of pain.