That is absolute, total and utter BS!

I swear, people are getting dumber by the day...
Hey, guess what? This is AMERICA not f**king MEXICO!!

What do you think would happen if you went to a Mexican school in Mexico on July 4th and told everyone there that they could not wear or display the Mexican flag on that day? You would get laughed right out of the country, that's what would happen!
We are in the U.S.A, we can display the USA flag whenever the hell we want, on whatever day we want. If someone doesn't like it, too damn bad, go back to your own country if you get butthurt that easy.