I personally agree that it's both really. Some people have a natural disposition to such behavior and the environment they're raised in triggers it.
I didn't say anything!
How about these? Aberrant, anomalistic, anomalous, atypical, bizarre, curious, deviant, deviate, deviating, divergent, eccentric, exceptional, extraordinary, fantastic, funny, grody, gross, heteroclite, heterodox, heteromorphic, irregular, odd, off-base, off-color, out of line, peculiar, preternatural, screwy, spastic, strange, uncommon, unexpected, unnatural, unorthodox, unusual. :P
Interesting. Why would you question why people feel comfortable around you or not?
Well if you ever need any help in the future in writing a scene like that, I'd be more than happy to try and assist you with my limited knowledge on the subject.