one interaction? some of us spent half our lives having 99% of interactions be like that - we've grown out it one way or another, but for many ppl "doing people" is HAAAAAARD ...just as for some differential equations are. we're just build veeeery differently. for many "the social world" is a hostile jungle, and we ca face it all right, but with a strong suit of mechanized armour and fully loaded weapons strapped to it.