Ok, to be fair here, he was quoting another person.
Yes, Bell said he adopted the motto, "I live to harass white folks," from an elderly black lady in rural Mississippi in the 1960s. The "white folks" referred to by that lady were apparently limited to those who had personally treated her in a very vile manner. So the mantra of "I live to harass white folks," if taken in this context and limited to it, is not anywhere like the caption of the video makes it out to be.
There are surely more pernicious quotes from the late Obama idol, Prof. Bell, which better illustrate Bell's radicalism and extremism. Bell's published works should offer a rich source for such material.
He was, but listen until the end, where he states HE adopted that motto as well.