People of any race or background, who likes metal in general, there are many types of metal so characterizing metal is what true metal heads won't do, unless faced with a someone saying miley cirus is metal, which she is definitely not. metalheads can or can not wear a jacket, army boots with a band logo. many metalheads choose to wear something else and that does not make them non-metalheads. metalheads usually but dont always wear some black. anyone who is dedicated to metal is a metalhead. metalheads in some-way can relate to the song that they like, so your type of metal is based on who you are, or they may just like the tune, or whatever(just as long as they are dedicated). metalheads are not druggies or drunk mossers. they are actually generally intelligent, even though some may not. they may drink or do drugs but that is on a personal base not a general base of metalheads.
An example of a metal head is someone who is dedicated enough to go to a concert if they can actually make the distance. so just because you live on a island in the middle of the ocean and cant make it to a concert it does not make you a non-metalhead