So your manager, in a retail store, that presumably exclusively sold non-flat-earth items, caved to a whack-job who wanted you to be fired because you wouldn’t waste your productive work time listening to his whack-job bullshit (closing is almost always more than turning the lights off and locking up), and actually fired you?

Sounds like the manager did you a favor. He did have a choice… standing up for his employees agains unreasonable nonsense like that.