Educated guesses are one thing; exact "guesses" are quite another, and one has to wonder where the 'guessing' is pulling its data.
Would it creep you out if I guess which month you were born in? Probably not.
Would it creep you out if I guessed your exact birthday, including month/day/year? Hell yeah it would.
It has nothing to do with whether or not one wants to be social, and everything to do with random, axe-murderer creepiness. Imagine if I walked up to you at a party and rattled off names of 5 random people from different aspects of your life; would that not freak you out? "Oh, you don't know me, but I know you ;)". That's virtually the same thing that is happening here.
Would it creep you out if I guess which month you were born in? Probably not.
Would it creep you out if I guessed your exact birthday, including month/day/year? Hell yeah it would.
It has nothing to do with whether or not one wants to be social, and everything to do with random, axe-murderer creepiness. Imagine if I walked up to you at a party and rattled off names of 5 random people from different aspects of your life; would that not freak you out? "Oh, you don't know me, but I know you ;)". That's virtually the same thing that is happening here.