It's not that doing action to a person of certain demographics makes the action immoral. What makes it immoral is the idea behind those actions. For example, there's no problem in saying all people are stupid, but saying all black people are stupid IS immoral, and doing actions based on that thought is also immoral. In that way, the "plough the fields" was a reference to black people being slaves and by selling Legos in that way, you are propagating the almost dead idea that black people should be slaves.

I was not referring to men and women being equal to the law, but being equal as humans. Black people and white people are biologically different too, but no one says that black people eat fried chicken because their brains are different. So, until a scientific study proves that women's brain account for them liking dolls instead of Lego, I will still think that's society that makes them that way. In fact, I think many sociological studies have proven that differences between men and women are different between different cultures, but I have not seen one article that stated that women tend to like accessories because of their brain.