I'm from the UK. Trust me, we have had black females who were popular before. They have one argument and they are evicted with no chance of redemption. See Shevonne.
Gina is the best example for this. She was the most popular housemate until the gp turned on her for no reason
John very possibly could have won that edit with the "But I'll tell you something. I didn't do it" midsommer murders esque quote. But he screwed himself over with the final comment
Exactly why I'm happy. It wasn't looking great for Tiffany because we all know John was telling the truth. His ego got the best of him.