Who are these "alpha" guys and who do they like to date?

There is this friend group of mine who told me that alpha males only date white girls. I don't understand this criteria. It sounds extremely racist to me. Asking this makes me feel bad but I do hear it a lot. Is it true? If it is not, who dou you consider "alpha" male as?

Who are these "alpha" guys and who do they like to date?
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