And thus tu quoque is indeed the correct response to this dreadfulness from Robert Reich: Trump and his White House don’t argue on the merits.

Tu quoque is normally a logical fallacy. It's really saying, well, but your side does the same thing! Which isn't an argument against my being wrong, it's a deflection of the idea that I might be.

Second, the writer commits two errors of debate, both so old as to have Latin names. First is "ad hominem," an appeal to name-calling and personal ridicule. The other is "tu quoque," or you did it ...