a real Severus Snape - a person who won't let you forget your mistakes and will rub

a person who won't let you forget your mistakes and will rub it in your face every chance they get

My math teacher is a real Severus Snape. He said I was a disaster and he wouldn't let me forget it.

My brother is a real Severus Snape. He made me eat my lunch in front of everyone when I spilled it.

My crush is a real Severus Snape. She said I was a mess when I asked her to the dance and she won't let me forget it.