[He ignores the comment about the Founder King. Ardyn doesn't trust him about the future- that's fine, he doesn't have to believe the other man about the past, either. Some of it may ring true (the name, the age, the details he shouldn't know yet does) but he doesn't have to buy in to all of it as unbiased.]

If you're so against it, then why are you living with- [my dad-] -with the others? If you wanted to be left alone so badly, you could've just done it here. So you're a monster, or a daemon- we live with robots and whatever the hell else showed up now. Nobody cares.

[He's not even sure he fully believes in that part of the story, either, but if it's true then so what? He hasn't done anything yet. That's why his focus is trying to prevent a repeat of whatever awful history made it all happen.]