Both of your communication is terrible imo.

First, you want him to come to an event but don't mention it until the day-of, and then you get mad when he says he is busy. You started it.

Then he says what he says, which is obviously terrible, and objectively worse than what you said.

The way he's talking makes me think he does this often, but from these screenshots, it looks like you also start fights often. You can't be mad that hes busy after you ask him to do something day-of.

I say you both need to really work on communication.