You don't have to be friends with anyone. This lady makes you uncomfortable, so disengage if you can't cope. However, do remember that the USA is an alien culture, even though we speak a common language (well, almost!) It took a visit to friends in Chattanooga for me to realise that. I felt as though I was trying to communicate with Martians! Your erstwhile friend will no doubt have been influenced by those around her. It's easy for us to see Trump as a narcissistic buffoon with a short attention span, but that's speaking at a distance. In psychological experiments, 8/10 people will change their minds about 'facts' when surrounded by people who think otherwise (look what happened in 1930s Germany). Your friend may be just one of the eight! So, okay, don't be friends with her, but understand that you may also be influenced in ways that you don't recognise. You could try one final conversation when she next rings, and say: "What you say sounds like racism. Do you really believe that?" Ask her how she has come to the conclusion she has, and what evidence she has, and from which sources. I am advocating a form of Socratic questioning in which you simply examine her statements and get her to explain them to you. If none of this works, then block her on WhatsApp. As I say, you don't have to be friends with anyone if you don't want to.