It's really not an issue, so don't make it one. He may even want to play in dramatic play and try on dresses, etc. Don't worry about it. He may just be trying on roles, and that's ok. That's one of the ways children learn more about being a mom and what it's like to raise kids, and so on. He will most likely grow up to be a standard male without issues. If he says pink is his favorite color, say hey me too! But I like red and blue and green too, so I guess I really like all colors!
ECE teacher, mother of 3, grandmother of a whole bunch