If I recall, what's great about the freedom of speech is that it allows the truth to fight on it's own terms. I fail to see how calling Mexicans taco benders is aiding the truth to enlighten mankind. It does just the opposite, in fact.
I'll bet that there are plenty of recent immigrants to the US from eastern europe who have no idea who, traditionally, bends the tacos we eat. Therefore, those who didn't know where the idea of bending a taco shell came from are being enlightened. Unless you have facts and figures to establish that Mexicans do not bend tacos, then you're in the wrong here.
Ahaha. Surrender now or I shall taunt you a second time. ;-)