Because uncomfortable and traumatizing conversations are best accompanied by tea? He's fairly sure he can dodge if you throw it at him, even from this distance.

"Do you really need a reason?"

He'll give you one if you insist, but it's sort of sad you can't take the kindness at face value. After a moment, eyes searching, he gives the most innocuous one that comes to mind with a bit of a self-depricating smile.

"I'm British. Tea in uncomfortable situations is something of a hallmark of our interpersonal relationships."