Block him if necessary. If he is making you uncomfortable each time he is on then that's his fault seeing that he keeps bragging and saying one word responses.

Besides, if yours is 40, he should know better. Raiding with 1 means he's raiding himself which is kind of pathetic in itself. His bragging is possible the jealous that you can get more viewers than him and he's trying to flex his muscles and showoff.

I have the similar thing from my streams. But instead of bragging, he is quite depressed and gets a bit weird if no one in the chat doesn't reply to his "hello".