There were those who were having a shitfit when Prince Harry married Meghan Markle.
But I suspect your problem with Kamala Harris won't necessarily be her colour: as Mike Penis is about to discover when he appears in certain televised events in the next couple of months or so.
Joe Biden has experience of her in past televised events: and perhaps that's precisely why he chose Sen. Harris as his running mate.
So y'see: her colour has less to do with his choice than you think. And it's because she can do that - think - more than, say, Mike Penis is why you're subconsciously afraid of her.
...otherwise you would have simply said 'Good choice, Joe': as I did just over 24 hours ago.