I hate to say it, but it happens a lot with me.
I bought my first 1911 because I had seen so many 1911's in movies, television, and video games and I fell in love with the design. I bought my .44 magnum because I spent too much time watching the Dirty Harry movies. I used to dislike the AR15 in a vain attempt at being nonconformist, but seeing enough of them in media eventually got me to learn more about them and even purchase one. I'm also currently hankering for an AK-74 and G3, also brought about by seeing them in movies and video games.
I don't really see it as that much of a negative thing though. I've come to learn about a lot of different firearms through seeing them used in movies, television, and video games. Entertainment puts the idea of the gun in my head, which usually leads to researching their history and learning about whats available out there for me to purchase.