It's worth noting that at a certain point things achieve such cultural penetration that very few teens rebel against them in that way. [1]
At some point they're simply treated as ubiquitous human endeavors.
[1] 7-11, Coke, iPods, Nike, McDonalds, Levis
When teens resist adults on these points, it usually manifests in minor styling differences or personalization.
(cross brand promotion, garish colors, etc)