I side with the coaches in these sort of things, unless a 3rd party who was there chimes in.
I know most of us believe we “know” better. But if we were in his shoes, probably would have done the same thing.
Culley doesn’t look like an overbearing tyrant, so I doubt it was so much that there was a disagreement, but rather how that disagreement was voiced.
maybe Culley didn’t want to scratch him, but wrestled with his conscious all night & a day & decided to do what he thought was right.
maybe Reid said something in practice, or acted a way that convince Culley it would only get worse if he doesn’t act.
Again, I have no idea what happened. Wasn’t there. But I’ve been in situations where I had to struggle through a tough situation with my best man on the sideline. He wasn’t being a team player & I couldn’t afford to play favorites.