Are you sure they haven't, though? Not even a novelty 3D film at a theme park? A friend of mine has no depth perception nd he won't go see things in 3D because he literally cannot see it, it stays fuzzy, and it really sucks for him to pay for that. and sure, it's frustrating if we go see films together, but I don't think it makes you an awesome friend if you want to put people through something unpleasant.Maybe they DO get headaches.

Or maybe they're being dramatic, or scared of new technology, in which case you're right. But you know, they might be telling the truth?