It'd be best, I think, to be honest with him. Granted, I know that's easier said than done...the guy in your post sounds precisely like one of my college buddies, whom all he posts on facebook or EVER talks about is conspiracies and one world people and all that..*ahem*...stuff. It, frankly, drives me nuts. But that being said, it's ultimately easier for you to politely ask he exclude you from such talk...if he respects you, he should comply.

Hope things work out for the best.

Hugs,
Harley

PS: Just curious, as I've yet to get a clear answer out of my aforementioned buddy...what's the problem with drones? Maybe it's the part of me that wanted to go in as a JAG talking, but I tend to be a fan of the things. Just curious for his perspective, is all, as I've heard similar discontent regarding them.