Nonsense. He was upset over the shock of losing, he spouted off, and now he’s apologizing for being an idiot.
You have no grounds to reject his sincerity. You point to nothing except that he made the mistake he’s admitting to and apologizing for. If anything, what cannot be forgiven is YOUR baseless condemnation.
“...YOUR baseless condemnation.”
Would you mind proving the “condemnation”?