Anyone who dares bring it up gets flamed for it, but yes, I think it's become trendy. It's still a lot more socially acceptable for a girl to dress and present as male, particularly teenagers. And when I browse Youtube or Tumblr blogs, the younger users are often the same type of kid - badly dyed hair, ugly piercings, ear plugs, baggy clothes and everything in their life is so random LOL. The same sort of kids as when I was fifteen, were saying they were gay, and blogging about being bisexual. Now that they're in their twenties, they quietly shut up about how gay they so were. Maybe it's just the types of channels and blogs I've visited, but most young teenage trans people are FTM. MTF is still taboo in a lot of places ie, not as trendy. It's too different. I can't work out why there are so many more alleged FTMs than MTFs online, when statistics indicate the balance is with a big MTF majority in the real world.
Of course it's not true for everything. Just like there are young people who are genuinely trans, genuinely homosexual, genuinely socialist, genuinely into metal, genuinely have addiction problems, there are many more who jump on the bandwagon, because it's always been cool to have something 'wrong' with you, and be outside the norm.
Maybe I'm being ->-bleeped-<-r-than-thou, but I just can't take a sixteen year old whose biggest problem is 'omg, my mom won't let me cut my hair short', and only posts about how awesome and/or 'beautiful' their friends are on Formspring, while not seeking any kind of community support or professional help, entirely seriously.
But, whatever. Maybe I'm wrong. I grew up in a small English town largely devoid of anything or anyone LGBT-related. Maybe that's how kids cope these days. But if it was (and is? I don't know) acceptable to say being outside the sexual norm was trendy, why is it so insensitive and ignorant to say that being outside the gender norm could be too?
That's just my opinion. It's not like I'm going around telling people that they're not trans enough, or thinking that they're lying. Teenage years are confusing. Is it offensive? I dunno. It's not directed at anyone here on Susan's, and I don't spend enough time in the blogosphere to think of any examples in particular. But it's something that grates on me from time to time, and I'm glad I'm not the only one to consider it.