My father, may he rest in peace, grew up in world where there were few black and Asian people, homosexuality was hidden, anti Irish(of which he was one) and anti Semitic. He would have struggled to live in this world today. But he was familiar with wars.
I have lived around the world and seen discrimination at first hand in all countries, I have lived in countries that have Russian Orthodox, Buddhist, Muslim and catholic and a bigot is a bigot no matter what religion is predominant. A shit is a shit anywhere. The nicest people I have encountered have been Muslim.