My father and uncle are both KIA's who know-not-so-much but my dad is the winner. However, get the two of them in the same room and you're in for one loud ride. It is probably important to mention that they are brothers, my father is the younger.
My uncle has been into computers since they were new, my dad still doesn't know how to perform basic functions, let alone write/speak/read English well. Who do you think claims to know more about computers? If you guessed my dad, then you win a cookie. What makes my dad a CKIA is that he will proceed to yell at my uncle/anyone for hours about how he is right and there are no two ways about it. The female portion of the family rolls their eyes and run to the other side of the house (they're so loud you can hear them outside).
He will do this to anyone else he thinks is wrong, including me. And he does not argue, he merely yells the same thing over and over again (wording slightly different). And if you try and leave, he will follow you around, telling you why he is right and you're not. He will dismiss all counter-arguments, proof and reasoning.
Avoidance does not work. He will be silent for a while and then come back to where you are, and start his lecture all over again. I have been wrong/stupid/too young and female to understand for 21 years.