What if McKay had been normal?
It would have been normal for McKay to let the Terrill's know he was a real man and not just some rich prissy city slicker. A normal person would have wanted to show his father n law that he can ride a horse and shoot a gun and use his fists.
He had been mistreated and humiliated by the Hannaseys for doing nothing. He reached out his hand in friendship and they slapped it away. A normal man would have wanted to kick some ass but McKay gets all upset they are doing something about it. What a moron.
Leech tells him they can cut Buck out and he can settle with him with his fists. Wow what an opportunity. Earn your respect from your father n law, Leech, your fiancé and the Hannaseys all at once. He declines.