Artists die from not getting exposure. This isn’t one of those “play my wedding for exposure” things. It’s being a regular song playing in one of the world’s most popular game franchises.
They should get paid, sure, but telling them to fuck off because the rate wasn’t what they want is dumb.
You could have responded without being an asshole. If we had discussed this politely we probably could have reached an acceptable middle ground and both learned something from the other person’s experiences and ideas.