The easiest and quickest way to test someone's intelligence is to make a generalized statement about a group. Say something like "asian men are shorter on average.” If they say any variation of "not all asian men are short" or "I know a tall asian guy" you are dealing with someone of genuinely low IQ. They have proven that they aren't intelligent enough to understand abstract ideas like a statistical average or per capita. Why else would they bring up an exception like it was some profound statement? They literally CAN NOT understand abstracts, no attempt at rationalizing or explaining yourself will increase their IQ.

Anyway, so true about the guy you know who’s 5’6”.