pink is the colour CURRENTLY being forces on girls and off boys by marketing people. Its not always been that way around. Strangely (or not if you read the science) children adapt to the colour they are currently being told they should like, rather than maintaining a preference regardless of marketing whims....
As I said in my previous post, pink/organe is preferred by most kids and 'innate' colour preference isn't gendered.
You've been denying your boys their preferred colour (and probably hair length), rather than forcing it onto your girls....
I hang out with a lot of home education groups. You'd often struggle to pick our the boys from the girls most times. This is partially because everyone is wearing clothes that are geared to tree climbing not looking pretty, but more noticably because the boys are as into the pink/purple/glitter/nail varnish/long hair as the girls.
School has, in my opinion, a profound effect in terms of consolidating gender stereotypes and making it almost impossible for young boys in particular to be express themselves as anything other than crew cut, boisterous, brave, etc. and to shun anything that appears to be even vaguely feminine stereotyped.