This has nothing to do with preference, trust me. Who doesn't like junk foods? That's not the issue, though. Most people CAN and DO eat vegetables. However, people like me CAN NOT. I have tried many times to introduce new healthy foods into my diet and am usually unsuccessful. I will not go into great detail about what happens, but it is not pleasant. Secondly, it has shown up on many things more substantial than MacLeans. Try Psychology Today, the Wall Street Journal, and many other publications. As noted in this article, Duke and the U of Pittsburgh are currently conducting a study. This is very real. What's a shame is that you are ignorant and unsympathetic to something you don't understand.

You can "buy" it or not. Doesn't change the fact that picky eating IS a true disorder and it's NOT a choice. My parents tried to introduce a varied diet with limited processed foods. However, my mom was a picky eater and I picked up a lot of her eating habits. She still eats more fruits and vegetables than I do. Even after trying many things, I have still fallen victim to a diet mostly filled with processed foods, but not by choice. It is definitely exactly what you said "a genetic tendency to dislike certain types of food" and it's not anything I would choose or wish on anyone else. Even to this day, trying to force myself to try new things makes me gag and feel physically afraid and/or sick. If you are not picky, I don't expect you to understand what it feels like. But try not to be so judgmental of something you don't understand or know anything about.