Absolutely girls and boys are different. They definitely play differently and prefer different toys.
But that doesn't mean that every girl is into pink frilly stuff, building blocks that make a kitchen, dolls, makeup, etc. And not every boy is into muscle cars, soldiers, violent games or spaceships.
Unfortunately, manufacturers rigidly enforce the stereotypes. I was out with my daughter one time at a department store and we were in the kids' clothes section. They might as well have put up a fence where the "girls'" t-shirts ended and the "boys'" t-shirts began: Girls' were pink or flowery or featuring hearts, ballerinas, kittens, puppies, etc. Boys' featured snarling superheroes, bad-ass trucks, etc. and were generally dark-colored. My daughter rolled her eyes at all of this; although she's a perfectly feminine girl, she still feels most comfortable in comfy dark sweatpants and a plain t-shirt.
There are many boys and girls being forced into unnatural stereotypes by society and by manufacturers. Here's a radical idea: Just make kids' toys and let the kids themselves figure out if they like them.