It sounds like as if he has an inferiority complex; his esteem is based on the supposed achievements of others. He is wilfully uneducated and proud of his pseudo-science.

If he is genuinely interested in further reading there is a whole host of books he can be introduced to (How Europe Underdeveloped Africa, A People's History, The Jakarta Method, Darker Nations or more liberal books such as Inglorious Empire, Confessions of an Economic Hitman or 23 Things You Didn't know About Capitalism to name a few). You could even potentially start with the fact that you are not a liberal?

However, you are up against an onslaught of propaganda to justify white supremacism. Relatively recent developments suggest that rest of the world may be slowly turning off that tap of superexploitation so expect to see a lot of coping and seething.

If he has made statements which have frustrated you because you instinctively knew were wrong but could not provide an immediate retort then take it as an oppurtunity for further reading and exploration.

Please take care of your mental health. In practice it will be challenging to persuade him off his delusions so you may want to invest emotionally and in time elsewhere.

/edits for clarity

Addendum - a word about privilege - one cannot choose one's ancestors (biological or cultural) but one can choose not to defend their barbarism, and instead sincerely attempt to understand the world as it is to better it; guilt leading to empty nihilism is useless.