i think that it's perfectly normal (in this "society") for someone to feel a little resentment/disappointment/confusion if something (i.e., riding fixed) is appropriated by a community to which this person does not identify. if this person does in fact, for example, identify first as "a biker" and second as "a fixed rider" then i don't think that person would feel bad about riding fixed becoming more "mainstream." however, for a person who identifies as a "fixed rider" first, and in some way identifies her/himself in constrast to people who ride bikes that are not fixed, i think, perhaps unconsciously, that they would not be completely enthusiastic about the appropriation of riding fixed by those people.

we all create identities that are in some way a resistance to something.