What the Fallacy?! (ELI5 Edition)
Tu Quoque
The Fallacy
When someone tells you not to do something bad, and you say 'But you did it too!' instead of stopping.
Why it's wrong
Just because someone else did something wrong doesn't make it okay for you to do it. It's a way to distract them from your mistake.
Example
Dad told me not to eat cookies before dinner, but I saw him eat a cookie before dinner yesterday!