So now that I've had a few hours to digest everything that happened, here's how it went.
For intramural flag football, it was actually a good game. That said, considering that it was a college intramural flag football game, too many people (spectators and especially coaches, who are also students) took this waaaaaaay too seriously. The rule at my university is that you can't block with your hands. You have to keep your hands behind your back and simply get in the way of a rushing passer. Well one kid knew he was beat and grabbed the defensive player in the back with his hands and nearly ripped his shirt. Obviously, that's a foul. Coach under his breath calls me a f***ing f****t. As much as I thought I'd never do this, that flag was in the air before my mind had even processed to reach for the flag and then throw it. Hope he enjoyed the long walk back of his dorm and the mandatory suspension that comes with it for getting tossed for addressing an official in that manner.
I made mistakes and I got some things wrong and I freely admit that. I also will say that physically, in in no shape to do anything that's actually competitive and faster paced like high school ball. Above all, I can summarize it in two words: Baby steps.