"A pink-haired Kaeya?" The blue-haired one repeats, unsure of whether or not Rosaria was trying to throw shade at him with that comment. Still, that tells a lot about what he should expect from Hythlodaeus. Rosaria is perceptive when it comes to people's natures, so he doesn't think she'd be too far off the mark there.

That, and the fact that Hythlodaeus called Rosaria delightful makes it too obvious that they might really be similar.

"Perhaps that was Rosaria's way of telling me I should consider changing my hair colour. Pink truly does look good on you." Neither of them is throwing snowballs now but the conversation they're having makes up for it. "I hope she only had good things to say about me."

Knowing Rosaria, probably not, but if she said nothing— then that's even better.