Lego did not decide that pink was "for girls".
Do you have a cite? Seriously. You obviously haven't worked in retail (at least as anything other than cashier). The stores have categories they wish to fill. They ask Nerf for "girls toys" and nerf either sends their boy toys to the girl isle, sends nothing, or sends girl toys. Given that "regular Nerf" ends up on the boys isle, and "Nerf Rebelle" ends up only on the girls isle, Nerf, not the store, decided that "Nerf" is boys only, and "Nerf Rebelle" is girls only. The store didn't object, but didn't make that choice themselves.
For your statement to be true, the distribution network for Lego would have to be unlike every other toy on the planet.
Outrageous claims demand at least some evidence. I think you made a large number of simply wrong assumptions about retail, then are relying on assumptions (that the store places items, regardless of the wishes of the distributors) that are wrong, and coming to the wrong conclusion based on wrong assumptions. Your logic is sound, which is why you are unwilling to listen to anyone else, but your assumptions are based on common sense, not fact.
Lego makes pink toys for the same reason that the store who sold Anita her sweater makes pink sweaters.
So stores don't go to makers and request "girs clothes" and get sent pink? The store would ask makers for "girls clothes" and get sent boys clothes in a girls cut/sizing, then the store, fed up with the options given, go out and make their own?
Reality conflicts with your opinion. I know which one I believe more.
She wants Lego to stop making toys that boys want because she finds masculinity to be offensive.
I never saw that claim.