There is a misconception that feminists hate men. But feminism is really about finding the root of socially constructed issues that affect both men and women such as hypermasculinity, rape culture, misogyny, and patriarchy.
kids can play as either and it has nothing to do with future sexual preference. chill out people. let your kids play. and also, to all you haters: even if it did mean something about future sexual preference, WHO CARES?