I'm less revealing around strangers and people I don't know very well, and I'm a lot more relaxed with my coworkers, even more so with my friends, and I don't hide anything from my wife... But I think NT's do that too. We call it trying to pass as normal. They call it manners.
It's too forward and a little rude to just be "all if you" to someone you just met, whether your an NT or in the spectrum. And if I behaved around a stranger the way i do with my friends, they'd turn around and run the other way. But my friends love me for me, or as much of me that I show them anyways. I don't think I'm 100% with anyone, except for my wife, and that's more because she's so keen rather then me wanting to be completely transparent.
So I don't think there's anything deceitful being an undercover WP'dian. It's not even really being undercover. It's just being polite, and i can get by fine being subtle for awhile. That's good for NT's and WP'dians alike. After all, if everyone walked around the store juggling their car keys while repeating apples n bananas at the top of their lungs, I'd have to do a lot more than listen to my iPod to go in there.
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We are not so different from potted plants in that, if given everything we need to be properly nourished, the outcome can be incredibly contrary to when we are not. A flower won't grow in flour, and neither can we.