gender appropriation people?

Okay, so I have a question for.. I'm guessing the ladies that share the belief that boys and girls shouldn't have to be categorized as different genders. I understand it's one thing for your son to choose to wear tutus. But when you say that, what about when you're pregnant and you wait to find out the gender to start buying baby clothes. Therefore you can buy pink for girls and blue for a boy. If you don't believe in gender appropriation, how is it any different from buying your newborn boy a blue outfit? I'm confused obviously and I want to understand. Why not buy pink stuff for your baby regardless of the gender of its true that you are against gender appropriation. I know some of you may take this as an insult but this question hasn't been asked and I've been contemplating posting it for a few days now because I know this is a topic people get heated over. Which isn't my intention. 
Second part: how would you feel if your baby boy was dressed in pink and had a little flower hat and someone at let's say, your local super store says aw what a cute little girl