It's somewhat true. It's more likely to meet a bulgarian boy who knows how to cook than a bulgarian girl with that knowledge in my opinion. Don't know why, maybe boys prefer to have a set of skills, just in case: cooking, cleaning, ironing, sewing... 
I, a boy, learned and knew how to cook in my early teens. My sister, who is married in the states, started cooking for her husband there sometimes just two years ago in her early 20's. And she doesn't have any knowledge of how to cook bulgarian dishes so I have to sit and explain to her on Skype. :)
I love to cook. But as you know, living alone and cooking dishes, not just quick meals, don't go too well together. You have to eat the leftovers and sometimes you're just not up for it. Still I bake cakes quite often, and I try to invite friends for a meal so I can cook as much as I like. :)
Baking is easier - frozen pizza in the oven is not baking, homemade pizza in the oven is baking. :) But it's hard to define what cooking is and what cooking is not. All in all everything you prepare might be considered cooking(if you actually cook any of the ingredients) - after all even to stir fry some veggies you still need a set of skills which you have and use whithout thinking. So using your set of basic knowledge and skills is still cooking. The best way to separate things is to think of levels: level 0 - you know how to switch the cooker on; level 1 - you know how not to set things on fire; level 2 - you know how not to burn things, how not to under or overcook things; 
And so on.
P.S: sorry for my long posts, I don't know how to write short posts. :D