Tennessee state Rep. Justin J. Pearson (D) gave viewers of Fox News' sister network a lesson in the dangers of white supremacy after his state wiped out its only majority-Black congressional district with the hope of retaining Republican control of the U.S. House.In a Friday interview on Live Now from Fox, host Christina Evans pointed out that state Speaker Cameron Sexton (R) had recently removed Pearson and every other Democrat from their commi…