What do you think about gender selective abortion?

Just asking because someone on Facebook was posting about how they believe gender selective abortion is 100% valid. For those that don’t know, it means if the fetus is not the sex that you wanted, you opt to have an abortion. I’m not sure how common this is and I have personally never heard of anyone doing this. But I think it’s wrong. Why would you have an abortion just because the fetus is going to be a boy or a girl, when going into pregnancy you knew it was going to be a 50/50 chance. I personally don’t agree with it. Thoughts?