The Sikhs need some sort of advertising campagin like the Mormons. "I am not Muslim." They keep getting attacked even though they are not from the same area as most of Islam and dont hold the same beliefs.
I'm guessing most skinheads didn't pay attention in 3rd grade geography, since India is at least 2,000 mi from Saudi Arabia. They're not going to be persuaded by a TV ad.
Besides, bigots don't care about differentiating: to them, one foreigner who wraps their head with a cloth is just as guilty as any another (skinheads aren't exactly persuaded by logic and common-sense, or they wouldn't BE skinhead neo-Nazis, right?)