I love this argument, just because it completely flips reality on its head. The intolerance that is being discussed is that of the Progressive US Left, who cannot tolerate any dissention from the current state of "politically correct" (here I use it's original definition). What you are describing is the reaction to it. It's a masterstroke of political reasoning, when you find a way to define your own shortfalls as stemming from the "other side".

Edit: I should add, it's amusing while it doesn't affect me, but the ramifications are horrifying.