Indeed. I have the diagnosis and it was basically worthless :-)

Though I might also digress and argue that being "open and friendly" isn't just a skill to be learned to function in society, but more a basic rule of ethics/morals. Which one might conclude by logic. Like "what if everybody was just nice and friendly to each other". This would be a nice world to live in. Instead it's more like "me first, fuck the others!"

So...can one actually be TOO open and friendly? Probably only if your vis-à-vis isn't reciprocal :-)