“If a person is going to preach ethics, as the Randians claim she does, that person has to be immaculate.”
Therefore the only human being that was, or ever will be, qualified to speak about ethics is Jesus Christ. OK, gotcha. Hence, ethics should never be discussed.
As a non-believer, I’d expand your comment to say “Unless we’re God, we have no right to say anything.”
Being assertive does make people stand up for the opposite, doesn’t it? Better than “Oh, those awful Liberaaalllls,” or “But...but...Clinton!”