Rub your nose in it

Generated image of a puppy about to have his nose rubbed in it
To rub someone's nose in it means to keep reminding someone about a mistake or embarrassing situation in a way that makes them feel worse. Instead of letting the matter go, the person keeps pointing it out again and again.

The phrase comes from an old method sometimes used when training animals, where their nose was pushed toward something they had done wrong. Over time it became a metaphor for deliberately making someone dwell on their mistake.

I know I lost the game, but you do not have to rub my nose in it every time we talk about it.