Sing this xkcd to the tune of "Modern Major General."
I'm guessing xkcd is not today fielding thousands of furious objections from offending every major all together; but apparently he was wise to leave one or two of them out.
Why is that? Possibly it's because these majors aren't very defensive; if you're a philosopher you can smile at the cartoon and say, "Well, that's just the analytic philosophers... but it's sure true of them!" (Or if you're an analytic philosopher, you can say, "Nonsense... where do you think math gets its fundamental assumptions?") Or if you're a historian, you can point out that history is a nearly ideal preparation for a career as a military officer, a foreign service officer, a political career, or even a career in international business.
Theology can laugh at "X therefore 3X" as a succinct criticism of Aquinas, who adopts Avicenna's proof for the existence of a single, simple, unitary God and then goes on to assert the Trinity; but they can, of course, point out that Aquinas does have a rather lengthy and sophisticated account that the joker might want to grapple with before he dismisses it. Economists, well, I suspect they will just smile along, recognizing the justice in the remark.
So if you want to mock academics, go right ahead -- as long as you're careful to make a few certain specific exceptions. Otherwise, kiss your job goodbye.