It reminds me of the House of Commons where it's permissible to lie but under no circumstances can your opponent respond by calling that lie out as a lie becaus

It reminds me of the House of Commons where it's permissible to lie but under no circumstances can your opponent respond by calling that lie out as a lie because that would be un-Parliamentary language. As a result, people twist themselves into all kinds of rhetorical contortions to imply someone is a liar without actually making the accusation.