My honest impression is that your post actually comes off a little elitist.
Really, I don't notice other people's clothes on the mountain too much. Most people dress like lunatics, but I think that's what I love about snowboarding fashion. You can wear stuff on the mountain you would never wear anywhere else. I've never had anyone mention anything to me about my clothes except my DK boots, which are just crazy looking so I understand.
I don't know crap about trends, though. So I guess I really can't comment on people trying to be trendy. I don't follow fashion, I just wear what I like.