Said friend once asked me my opinion on those ancient aliens television shows. I told them I found them highly offensive because mankind has made some absolutely mind blowing achievements in science, math, and art, and to use spurious, hand wavey explanations that attribute those achievements to aliens robs those cultures and societies of the credit they deserve for their knowledge, ingenuity, and creativity.
A similar time, someone tried to tell me that everything from computer chips to cellular phones were the result of reverse engineering stolen alien technology. I told them flat out that that's absolute bullshit and even a know nothing guy like me could trace back developments in science and engineering to the very origins of these technologies, with names, dates, organizations, and all. I sure as hell nipped that one in the bud.