How do we draw the line between whatever -ism and Bayesian inferences? You are seasoned manager for years, you found that your fellow countrymen are much more likely to follow your leadership style than any other group of different cultural background. Let's say it's a fact that you identified through years of trial and error. Based on this fact, you decide to hire only certain groups. How is this racism? How is this different from a university has a college list. Any graduate who does not graduate from the list will not have an interview with your company -- It's super narrow minded and it can considered discrimination, but is that some kind of -ism?