I clicked on this thread and my mind is boggled by what people are suggesting.
Racism stems from Si and Te, and Fe and Fi is the savior? I suppose this exempt other functions, especially the intuitive ones. This is such a mouth-dropping misapplication of MBTI...I think I lost a little respect for some people in this thread. No one is stopping to question if this is taking it a little too far? Some of the replies in this thread illuminates how clearly some people need scapegoats and that's made all the more easier when you have a handy four-letter coding system to slot them into.
Here's some light reading: go pick up a book on ideologies--you can start with Karl Marx since he's most famously explained what ideologies are, then you can move into some authors that deal with racial ideologies, I've personally found this one to be a good starting point.
Once you've got a small grasp on what ideologies are (and now for my Victor moment...MBTI is one ) and what a complicated mess of psychology, sociology, geopolitics, and economic push/pull factors they are, if you armchair psychologists can pinpoint specific functions that give rise to racism then go back reread everything you just read but this time with some reading comprehension and critical thinking skills.