stone-thrower in the glasshouse
One who acts without thinking about the consequences one’s action might have on others whose similar action might have on one; one who blames others for the fault which one has oneself.
He is a stone-thrower in the glasshouse. He always parks his car in front of his neighbor’s house (in a style called rockstar parking), blocking the neighbor’s car. What would happen to him if his neighbor also did the same?