Nice opening to a good post.
I see parallels to skiing & snowboarding. On the mountain, skiing is seen as the traditional and (yawn) adult activity.
Snowboarding is claimed by the newer generation but that alone is not enough. The kids have this curious need to set themselves apart even further with baggy pants and XXXXL jackets.
When the snowboarders start to carry messenger bags, the anthropological overlap between fixies and snowboarders will be complete.

She drove a Plymouth Satellite
Faster than the speed of light