Mass Hipster?

But the most recent outing of the word, the one used here means basically the same as 'poseur' a purely derogatory term.

is it that derogatory though?

I don't think it is, on here, the way I see it, it's just a descriptive word for a trendy young person who owns a bike.

much like in cycling labeling someone a "roadie", or in music calling someone a "punk" or "metaller"