Janie has a point. He may not have even noted how offensive his behavior was.

If you had sat down quietly with him, explaining that the maid had quit and that he was putatively a grownup [being careful not to flame him] it might have been more effective than outing him. He probably never had to clean up after himself before. Abandoning the other bathroom to him was clearly and completely the wrong answer. It sanctions his behavior without any suggestion of correction.

Even though his behavior was known to all in the house, sometimes a little guidance is better than a slap upside the head. It depends on how dense he is.

Properly done, assertiveness gets the desired results. Aggression results in wars.

Growing up can be a difficult process.