Many children go through a normal stage where they are exploring gender roles. A normal family will see this as a stage, not make a huge deal out of it, and gently guide the child toward the culturally appropriate gender role. When a liberal family has a child go through this type of stage, they believe that they're supposed to encourage them to be different from greater society, and they rejoice at the idea of having a "diverse" LGBT child and encourage the child to be as weird as possible.