Boys don't want to be friends with girls

So a few days ago, I was on MLIA and there was one about a girl telling her friend that boys don't want to be friends with girls, and it got the wheels in my little head a-spinning. There are a lot of guys that I love hanging out with. and I feel like they are pretty awesome friends. But I don't want any more than that from most of the guys I hang out with.

For example, I spend TONS of time over at my old FHE brothers' apartment. They call me to invite me over if it looks like a whole day is going to pass with out me stopping by. I adore these boys, and consider them to be some of my best friends in the whole world. However, they are my brothers to me. I don't want to date them. I want them to be the guys standing menacingly in the background when I leave on dates because they feel protective of me.

And I have my friends from high school. I adore them. I think they are the best guys on Earth. I think they could all but walk on water. and if they needed to, they could probably do that. But there's only one of them that I would seriously date if the opportunity presented itself.

So does that mean that I should consider every guy that tries to become friends with me interested in me? I don't understand this principle.