Just let it roll off of your back as best you can. I'm sitting around a campfire, and one of my friends starts up, "so you're a physics guy, don't you think that the Earth could be hollow?". I offered to give him a list of reasons why 99.999% of scientists don't believe that particular theory, but he genuinely wasn't interested. He started attacking the "framework in which our scientific theories were entrenched". Like, it's cool that you're trying to poke holes in shit, but you're not going to get anywhere without "stooping" to stand on the shoulders of the giants that came before us, as they say. I guess anti-science-establishment-ism would make more sense to me if the technologies governing our daily lives weren't progressing primarily due to scientific research. It's a really weird disconnect some people have.