I think this is very possibly true. I come from a family where crying is...well, discouraged. As a teen, I tried not to cry at all, even when my dad was dying. I just felt like that's how I was supposed to act, stiff upper lip, all the time.

Then I got a little older. I saw that other people did not have the same anti-crying stance that my family did. And I found a movie that made me absolutely weep without fail. To my shock, believe me. Now I cry sometimes over movies. Certain specific movies can get me going, at least. Books pretty much never, tv so rarely I could probably count the times it's happened on both hands and have several fingers left over, music yes when I'm in the right mood. (Like ANY song can bring it on when I'm down enough. Even fucking bright and shiny happy songs. Which I find utterly bizarre, btw.)

Anyway. I don't think there's necessarily anything wrong with NOT crying at media. I personally am never scared by horror flicks because I just never can believe that any of it's real, not even with a tiny sliver of my brain. They bore me. Your brain might just be like that about everything that brings on the tears in other people. Such is life.