Urban Legend: An American flag should be burned if it touches the ground

False.
One of the signs of creeping old fogeyism is finding out how many of the irrefutable truths we learned as youths turned out to be false. Today’s being Flag Day reminds me of yet another cardinal rule I assimilated as a child which I later discovered was wrong: that if an American flag is allowed to touch the ground, it should be burned.
The rules we observe with respect to our flag are laid out in the U.S. Code. (These codes specify how the flag should be displayed, but they do not establish any legal penalties for those who violate them.)
Urban Legends Reference Pages: Holidays (Burning Desire)