One of them loves Transformers and Ninjago, we get her those toys with no mention of boy versus girl toys.
I just don't understand what the problem is with needing specially made toys for girls to offset some perceived injustice when they can play with the boy toys just as well.
Also the question is how do you identify female LEGO figurines? If you add feminine traits like lipstick or long hair, aren't you cementing another stereotype? Or adding boobs - again you are exposing yourself to criticism. I'd say as long as it doesn't spot a beard, any LEGO figurine can be taken as male or female at wish.
I suspect the criticism assumes LEGO firefighters are male unless they wear lipstick, because I don't think all LEGO firefighters are bearded.
And, as you say, what is the problem of playing with a figurine of the opposite sex? We even bought our son a Playmobil horse with girl tender that came in a pink box. I have yet to notice any trauma it might have induced. Maybe the payback will be in 20 years when his psychotherapist will expose our deeds.
Edit: here is a random LEGO firefighter I googled. What does make it male? http://ecx.images-amazon.com/images/I/61cMG%2BjM8hL._SL1500_...
I don't see fire fighters or policemen or construction staff, so her statement (and other peoples argument) is valid. How to interpret this fact can be tricky, because there's still more variety than traditional 'girly' toys I think, but when contrasting this with the "City" line of toys (http://www.lego.com/en-us/city), the gender bias is blinding.
I think it is great that Lego has developed a theme that isn't focused on physical confrontation. I have three girls who play with Lego and they request a mix of sets. For Christmas, they requested sets from Friends, Lord of the Rings, and Ninjago. My four year old got a Chima set. They don't see it as a girl vs boy thing.
Now, if I was heavily into buying Lego bricks, I'd also mix from the different sets to have more situations, and my kid doesn't really care if his toys are action figures or dolls.
You know what "traditional" girl toys are? What previous generations, or "parents", say they are.
Please show me what makes the actual firefighters and policemen "male"? I see some figurines with beards, but many without beards - they could be any gender.
Also never mind the fact that including many female fire fighters would be a lie, because the real world isn't really like that.