Valtiel cannot stand humans. Humans are crude, blunt, unnecessarily violent, and they smell bad. As a frost elf, he has better things to do with his time than suffer one of them. But if it will get his friends to leave him alone about making nice with their allies, he'll at least talk to one.

That doesn't mean he has to like the human—even if Kero is beautiful, and smells good, and doesn't really act the way Valtiel expects. One conversation, and then Valtiel can go back to ignoring him.