pot is calling the kettle black

and that's the pot calling the kettle black

Prov. You should not criticize someone for a fault that you have too. (Not polite to say about the person you are addressing.) Bill told Barbara she was sloppy, but Bill never cleans up after himself, either. That's the pot calling the kettle black. My sister says I dress funny, but if you've seen some of the clothes she wears, you know it's a case of the pot calling the kettle black.