It might be worth reconsidering that viewpoint. As you say, we're good at hate. We've been good at it, too.
We've seen that something as simple as preferring male children to female children has dramatic societal consequences. It might be reasonable to decide you want to bias your child against being left-handed — lefties do have higher rates of accidents due to using right-handed tools after all. What might the societal shifts be as a result? Might we effectively loose some diversity of _thought_ and progress in our society at large? How might remaining lefties be perceived?