He lets the first matter drop. He won't press her, not on that, and not when they agree. No point in it.

But he does frown, then. "I don't mind," he says. "You can speak how you want. It doesn't bother me."

Probably because he hasn't heard those words before, but, there you go.

"If it doesn't matter for me... does it matter for you?" If he's not allowed to claim he isn't a good 'person', then his friend shouldn't, either. At least, that's how it works in his mind.