One thing that needs to be considered is a sort of “cost-benefit-risk” analysis.

The problem with acceptance of teen girls is the risk of costs. Basically, you have biologically adult or biologically juvenile-adult humans with at least some adult motivations but the social status and protection afforded to children. Combine that with a male brain that’s as focused on secondary sexual characteristics (that teen girls definitely have) as much as the social norms governing sexual behavior and you have the risk of consensual sexual interest/activity or perception of it that has serious, life changing costs included.

The solution–of course–is to use social controls to push teenage girls out of the social environments where physical interactions are even possible.

Transgendered people are somewhat different. The cost-benefit-risk has two components–social and “biological”–where the biological is tied to being a “functional” reproductive partner and the social is tied into the whole perception of gender roles and sexual roles.

For some, the risk of being homosexual or seen as homosexual is very real because of their religious (and therefore social) beliefs. Being seen as a homosexual challenges their place in the social networks they rely on.

For some, it’s a matter of perceived deception by transgender people based on the differential–real or not–between societal gender roles. There are costs and benefits to each gender, a bias toward or against one’s own gender, and they see people who cross from one to the other–something many people can’t imagine themselves doing–as “cheating the system”. This can prevent them from seeing the more personal costs of being “mismatched” for transgender people.

And, for some, they simply see transgender people (and teenage girls) as using or having an un-competeable or unfair strategy that threatens to break down the system they rely upon for support and survival. It’s not so much a “should” thing as much as “must” thing when you have someone–say, a middle aged woman–with no/little marketable skills who depends on the social norm of the man-as-supporter. While she can (and women often do) learn how to become self-sufficient when their social situation changes, her sunk cost really creates a challenge for her compared to other women who aren’t so dependent on the same social norm.

So, in many ways, the “hate” is a defensive reaction to perceived challenges to the ways of life people have sunk a lot of effort into. The way to change it is to either change the perception (assuming there isn’t a real challenge), target those who have little investment so far (i.e. the young), or change the way of life. To change the ways of life, you have to understand it, identify an alternative that is as successful/preferred, and nudge people to transition. (Or force them through technology or economics.)

One of them weighs fifty pounds more than the other, for starters, with a great deal more bone mass. I know some trans like to say that taking hormones makes them lose bone mass but if they did then they’d all be diagnosed with SEVERE oestoperosis. And we have NO idea what their personalities are like, at all.

You say ‘oh, this woman is trans’ and what, you suddenly know she grew up hanging aaround with boys and trying to awkwardly learn football? That she spent her childhood sureptitiously trying on makeup and dresses? You can suddenly know that she is superfemme? Or that she spent a little time thinking she was a gay man?

I’m sorry, but you know none of this, and any assumption based on this is a prejudice as bad as any other.

Take the following argument:
“You are a trans woman. You didn’t grow up as a girl, with our troubles, so you cannot be counted as one of our number.”
and transpose it onto The Fresh Prince of Bel Air:
“You are a rich black man. You didn’t grow up in a rough area, with our troubles, so you cannot be counted as black.”

Like any analogy, it isn’t foolproof, but as an overall concept what is different?

As for trans and pubescent girls being ‘threatening’… uh, Crazy Old Doctor Freud much? :]

Weeeeell, I’d say I’m more full of terror because there seem to be naked underaged girls.