Sure, but that doesn't mean we can't enjoy each other's company while we're here, does it? You should get to know the people you're stuck with!

[He doubts Joel will be easily convinced, if it's possible to convince the man at all, but Kaeya's trying?? He's trying here.]

Speaking of which, my name is Kaeya. Kaeya Alberich. Pleased to meet your acquaintance, Mister Cheap Beer.

[And he'll continue to call Joel that until he's been given an actual name to call him by.]