Why does Scout feel indignant when she learns that women couldn't be in the jury in To Kill a Mockingbird?

It wasn't that it was better for women to not serve on a jury, but up until the mid 1900's women weren't treated as equals to men. Men felt they were smarter than and superior to women, and felt women should stay home, cook and clean, tend the children and keep their mouths shut. We have since taught men just how wrong they were.