Try not to distract him from his task.
One of the nice things about hearing aids is that you can turn them off, when you’re doing something that requires careful attention and good focus.
Would a dentist wearing hearing aids do better work than one who didn’t?
How about people who work in intelligence agencies?
Does getting yelled at affect their ability to do a good job?
Can an incoming cloud of rotten tomatoes affect the output of intelligence workers?
Whatever their motives for getting into intelligence work, what makes them stay?
If you know anybody in that line of work, ask them why.
Might not mention any recent Hollywood movies on the subject.
More? Start here.