How many? Not many, if any at the moment.
A lass I tried to get to know at work, but she does'nt pretend I don't exist.
No I would'nt say I let that happen to me, going nuts over someone who does'nt notice I'm there. Been there, done that got screwed up over it,.

As for why it gets me down?
Well its not the "I don't like you" part actualy, thats comprehendable, thats communication, the result of the last ten thousand or of so years of human development in this wonderthing call 'speach' . Its the "you don't exist" part that isnt, the lack of communication that is strange. Perhaps thats a web thing?
Maybe thats cultural or a city thing, or who knows, but to me its very alien.

That said I'm the dyslexic and thus wired up differently, so maybe we should reverse that, they're the humans and I'm the alien.
Just don't take me to yur leader, I've seen them on TV and thats enough.