Blue Nails?

I was watching a movie.  All of a sudden the little man came in to show me his painted nails.  Oh and they are such a pretty blue.  He did a really good job.  I commented on that and he told me he took his time.
So he went to daycare like that.  I didn't have the time or the inclination to try and find polish remover.  And if it was gel paint my remover wasn't going to help anyway.  He came home and asked if boys wear nail polish.  I told him some do.  And he was fine with that.  He told me one of the boys at daycare laughed, but he wasn't overly bothered.
That as reminiscent of when the little woman put her pink hat on her baby brother's head and Papa took a picture.  He then posted it to facebook or used it as his profile picture or something.  The flip comment made was why would anyone ever put a pink hat on a boy.  Color is only gender specific to the person deciding it is so.
There are some stereotypes I am sure I just pass on without trying.  There are others I try very hard not to.  I want them to be free thinkers and make their own opinions based on their own likes and experiences.  So if the little man wants blue fingernails....so be it.  It doesn't hurt anyone if he does.  Just like if he wants to wear a pink hat...or his sister wants him to wear a pink hat...so be it.