A friend of mine insists so much on this theory he sends me articles and videos from super unreliable sources of random people claiming its science, but all of

A friend of mine insists so much on this theory he sends me articles and videos from super unreliable sources of random people claiming its science, but all of them fail to include actual proof, or really an explanation that makes a little sense. When I try to bring up the "show me coherent info" to him, he just avoids the question and continues to say that we are being shut from freedom of speech and from the truth. Almost like a cult where they need to believe this otherwise their reality would suck a lot