By framing Alex's opposition to things like black people and rainbow flags this way, Alex is trying to hook the audience by appealing to something that they could easily believe. This could possibly be the belief that Alex has that everyone says is racist. You know, all those times Alex gets called a racist? It's got to be because people are misrepresenting his stance against corporate use of Black Lives Matter and rainbow flags. That's got to be it. He's not actually a racist.