As a population, we are generally all stuck in this awful habit of putting people into a box to make sense of their decisions.
But our bias of what we think fits in that box or what we deem "normal" depending on gender isn't something we should force upon others.
One of my sons is into all things pink, unicorns, rainbows and mermaids.
For Christmas all he wanted was a mermaid Barbie. Being on Santa's nice list, he received one and promptly called it Rainbow. He adores it.