So, I had a conversation with my sisters husband about politics, he gifted me a book (the power of geography) , which he claimed to be leftist..... because it merely mentioned colonialism. He framed that as anti-white racism and how we, the 'whites', should be proud of our 'accomplishments' and how it's badass that 'we' conquered the entire world.

He then further went on to mention that after colonialism 'ended' the natives didn't know how to do anything, because they kicked the smart whites out.

What the hell do I do about this nutjob? Is there any hope for him? Should I even try to convince him that he's an absolutely moron?