From what I have read, children across the ages have always played with gender roles and been interested in their bodies. It is a natural part of child development. Given that the majority of kids play with that, but we have a small percentage of homosexuals and an even smaller percentage of trans people, seems to explicitly state that gender non-conforming behaviour is really just an indicator that a child is exploring the world, and figuring out what they like.
Plus... Am I gay because I like theater as an adult? Is a gay bodybuilder not gay because weightlifting is stereotypically masculine...?
No, gender nonconforming behavior in children is not indicative of adult sexual orientation, because children are children, and they like to explore different types of play. A child who likes to pretend he is an astronaut will probably not grow up to be one. Similarly, a boy who likes girl's toys is probably not a homosexual.
No, gender nonconforming behavior is not indicative of adult homosexual orientation, because children at a young age are learning, and like to explore different things. There are also variations in children. Some boys are more feminine than others. That is okay. Boys and girls should explore the world around them, without feeling like they are being judged as who they will be as an adult.