I think growing up in the country with lots of farm animals is very non gender specific. Everyone has an even playing field. Everyone hauls the feed, everyone gets chased by the crazy rooster, gets jumped on and eaten by the randy goat, stepped on and bucked off by the horse. You wear your grungy clothes too that by the end of the day are as smelly and dirty as anyone.
With land and the responsibility of farm animals, a persons identity isn't tied up into being what a female or a male does or doesn't do because if you want to be a contributing member you do it all.
At that point whether you have dolls are trains in your bedroom becomes moot because it isn't what defines you.
It's only when you hear of someone spending too much time with the sheep, then and only then is sexual orientation is in question.
:P