Last week, a mommy blogger caused a firestorm with her blog post  “My Son is Gay” about how her 5-year-old dressed up for Halloween as Daphne from Scooby Doo. Her little boy had had second thoughts about wearing the costume, afraid that people would make fun of him, but she pushed him to wear it to his preschool. “Who would make fun of a child in a costume on Halloween?” she wrote. Well, lots of people. And she was angry. “If you think that me allowing my son to be a female character for Halloween is somehow going to ‘make’ him gay then you are an idiot. Firstly, what a…