I have a bizarre double life.
I do a lot of trans* community work. It's hard to do that work unless people know I have a trans* spectrum history too. There is a huge difference in the way trans* people treat you if they know versus if they don't. I do a lot of education, community building, and advocacy. I doubt that the trans* community would support any of that, especially the community building, if they did not know that I'm at least somewhere on the spectrum myself.
But sometimes it's nice to not be "on" having to do that work. People of both trans* and not trans* persuasions seem to very often find me rather intriguing once they know that I'm somewhere on the spectrum (don't ask me why; you will have to ask them). So the moment someone finds out, I end up back in education, community building, and advocacy mode.
As a consequence, in my social life I do not disclose and I tend to be very stealth. I very openly masquerade as a strong, very engaged ally. But I don't disclose that I'm anywhere on the spectrum myself. And I tend to socialize with a very different group of people from the ones I work with.
What's wrong with being open and proud?
Not a thing. But it is not the way that works best for some people sometimes.