Thank you for sharing your experience. I am sorry that you faced such blatant racism and bigotry.
The Socratic approach is an excellent method to pushback against such claims. Often the people touting these claims have only surface level knowledge or only believe that because it’s what the hear from tv, friends, or parents. They have no real facts or knowledge to back up their beliefs and are often easily defeated or led to see the inaccuracies of their beliefs.