Lúcio tells the man that he wants to be himself, and no-one else. That being said, Lúcio declines the power and tells the man there must be some way for him to be himself, instead of picking up who other people are.

Does the man tell Lúcio it's controllable? If he does, Lúcio will ask how he feels about it. Does he know how uncomfortable it would make people?

He's being a little harsh, but he doesn't like the general set up of the area. He can't help it.