"But the arguments you're making as to why I ought to accommodate "standard" transfolk should not, I'd think, be universalizable to include the full spectrum of Tumblr bullshit."
To be sure, if I actually met someone in real life who identified as something seemingly absurd, I might be put off. If Emily and Alice from http://pluandfawn.tumblr.com/ turn out to be real people, I'd probably be less inclined to talk to them. However, if I am required to interact with them, like in a classroom setting or in any other activity, I'll let them clarify their pronouns and I'll adhere to them for the sake of convenience. I don't think that they actually identify as Pluto and a Fawn, but that's really none of my business, and I don't want to talk to them about it.
"It's not a matter of "bothering." You're acting as though calling that person Darth Vader is passive, rather than active. Calling him "Darth Vader" is active. Calling him "Darth Vader" is bothering. Why bother?"
It's passive in comparison to trying to fix him. Obviously if he didn't identify as Darth Vader, everyone's life would be easier. But the alternative isn't normalcy; it's getting into a ridiculous shouting match over nothing. Between yelling and just moving on with my life, I choose moving on.
Like I said above, there isn't really a moral obligation to do anything. But your life will involve fewer fights with strangers if you just keep swimming.
"Because it is ridiculous? Since there are in fact two (2) genders (let's not traverse to the Klinefelter syndrome etc. area, we'll simplify for the sake of this discussion) calling someone "pyrogender trifox" or "anglekin" or "whatchamacallit" just feeds their delusion. People who honestly think they are such things should seek help."
I fail to see where I have an obligation to do anything about other people's "delusions". You want to identify as a dragon? Be my guest. If I need to talk to you on a frequent basis, I'll probably just use your preferred pronouns so I don't have to talk about your gender identity.
"But then again I too believe that "it's no skin off your nose" is not a valid argument in support of any argument. Why not? Just because. Are we back in the fourth grade?
You can feel what ever you want. But you cannot expect us to accept your truths either. Giving that argument just gets us to this roundabout which is unproductive, but very accurate on reflecting the current state of the discussion."
I feel that I've been clear insofar as I'm not advocating that everyone believe in other people's gender identities. All I'm saying is that for practical purposes, it would be beneficial for everyone to just go with it.