Transgender at 6? Or douchetastic parents?

So this story showed up:

http://shine.yahoo.com/parenting/transgender-girl-s-parents-sue-for-her-right-to-use-the-bathroom-201415013.html

There’s a larger issue to me – whether or not a 6-year-old is mature enough to know if they’re ‘transgender’.

People can know if they’re gay, or at least have a guess, that early. That doesn’t surprise me. But I don’t see how a 6-year-old kid is even developed enough mentally, let alone physically, to claim being transgendered. It seems much more likely to me that the parents are projecting their own politics onto the kid. Which makes them the awful example of liberal parenting that, as a liberal, makes me freaking cringe…