You really believe that Barack Obama's Vice President for 8 years is prejudiced against African-Americans? Or is it more likely that you don't like Joe Biden anyway, and that you are just seizing upon an opening for a purely political attack? To use an old conservative line: THIS IS FAKE OUTRAGE. If you cared anything at all about racism, you wouldn't defend Donald Trump as much as you have (over Charlottesville and other such dumb things he has said and done).
For the record, even Donald Trump's current press secretary, Kayleigh McEnany, said that Donald Trump was a racist back in 2016. She said this on CNN and the video of that comment is readily available on YouTube. This "Joe Biden is a racist" crap is not a winning strategy for Team Trump.