Sikhs have a little different look about them, IMO. They trim their beards in a romantic way, are somewhat dandy-ish, and wear their hair long under a beautifully wound turban. They have more delicate European faces and larger, more liquid dark eyes. The ones you meet are different in demeanor as well, are charming and have a sense of humor. They appear to treat their women far more kindly than Muslims. In short, they are quickly distinguished from Muslims.
Sikhs are not trailer trash or third-world rejects.