I'm very feminist by most people's standards but I don't think this is necessarily a problem. The idea that pink is for girls and blue is for boys is boring and restrictive, but it is nowhere near the problem that a lot of other sexist cultural messages are.
When it comes to girls' clothes for example, I don't give a toss if they're all pink (though, as I say, it's boring - and luckily there's actually a huge range of kids' clothes to choose from in every colour, and my DD chooses freely from both "girls" and "boys" stuff). What I DO care about is that clothes labelled as girls' carry messages about being gorgeous, cute, even sexy, princess, kittens, butterflies, etc etc in other words passivity, softeness and appearance are what matter, while boys' clothes carry messages of exploration, science, construction, sports, activities etc and sometimes also about being "trouble", "rascal" etc. Those messages are very worrying to me and I think they reinforce the deep, deep cultural gender norms that lie behind so much really damaging sexism and inequality.
But there is nothing wrong with pink, there is nothing about pink that stops you from doing anything, and I don't like campaigns like pink stinks because they suggest you can't enjoy pink even if you want to. My DD has a room that's cream and pink with green and pink furniture, why not if that's what she wants? I love pink myself too. And I'll happily paint both our toenails pink (or purple, or silver, or whatever it is that day). To me, any colour is to be enjoyed by anyone who wants to. Same goes for boys liking pink, or blue, or whatever they like.
DD has a pink t-shirt with a very kick-ass robot on it, she loves it. No problem with that.
Hillary Clinton wears pink, Angela Merkel wears pink, and plenty of powerful men wear pink.
But I will always counteract any message that tells DD she has to be merely decorative because she's a girl, or that there is anything she can't do, and the same goes for any sexist message to boys.