"Unless we're in an emergency situation and turning them red will slow you down, don't mess with the color." Could he make an argument for it being some kind of tactical decision? Yes. Would it be the truth? No.

The truth was, he was used to it and he was comfortable with it. The truth was, his associations to seeing without that red filter were either very, very negative or very, very deeply positive but also painful, and he didn't want to revisit either.

Sinister and Jean.

He hoped that the blunt statement would be enough for Sandy to leave it alone, even as he reversed the entire process to put his glasses back on. He wasn't interested in being a dick right now. Not when he was, surprisingly, enjoying the company.