His credibility with his mother just went down the drain.
After all your mother’s done for you, this is how you repay her? The woman who cooks for you, cleans for you, puts a roof over your shoulder, makes sure you don’t end up dead in a ditch somewhere, this is how you repay her? By sticking a leek in her sink and screaming “there’s a leak in the sink,” so she frantically searches for water escaping her pipes. The ol' leek in the sink routing? You know how expensive water damage can be. It's not funny. For shame.
Good for this woman for standing up for herself and beating her son with a root vegetable. Ingrate.