Yeah, Sikhs got screwed after 9/11 because that dickhead OBL happened to wear a turban. Vigilante beatings, shootings, and all kinds of crap. The stupidest part is that 99% people in the west who wear a turban aren't Muslims. Even the 9/11 hijackers didn't. Fortunately Canada was a little more sane at the time so I came away without incident.
Ironically, we went through a similar thing that America did with hardcore Muslims 300 years ago, except it was far worse. The Moghul empire tried to violently convert us all to Islam, and had we not succeeded in fighting back, there may have been another billion Muslims for the US to deal with in India.