Around here, all sorts of guys wear hemp anklets, myself and plenty of perfectly straight guys included. Some are, say, soccer players. Some are stoners. A lot are both, heh. Some just don't give a shit what kind of image they portray. Hemp's a big thing - necklace, anklet, bracelet, whatever. Outside of that I don't see much on the ankle, but plenty of random things on the wrist. Wouldn't call most of them jewelry, though.
If you're upset about people calling them ankle bracelets, "remind" them that the words bracelet, brachial, etc. come from the Latin word brachium, which means arm. So does the word pretzel. *nod*