I’ll meet you part way on that, when the use of force you are defending against is unlawful or dangerously excessive. But you cannot honestly read that in this situation. He got ejected. He retaliated. That is not self defense and no jury should buy into any claim of immediate threat that justified the attack he launched.
Getting dissed or getting a bruised ego is no legal justification for throwing punches.
“But you cannot honestly read that in this situation.”
As the story is written, I sure can. If they really shoved him through the door, that’s excessive, because there is no need for it. You could simply open the door, and push them outside without ramming them into the door.
Perhaps that’s not how it happened, and just the imagination of the writer, but as written, it sounds excessive to me.