If you really wanted to be critical of someone, you could try: "That's the epitome of hypocrisy!" (But don't expect to remain friends after saying that 😲 ...)

就你能！

This meaning of "rich" has nothing to do with wealth: The meaning is "rich" = plentiful or abundant, magnificent "That's rich coming from you" means "that's magnificent coming from you". The person saying it is being sarcastic. Indeed, he probably means the exact opposite. You would only talk this way if you were at least a little bit angry.