I am willing to give up time out of my life (which is not renewable) for money from a company (which is renewable) and I am treated with contempt at job interviews like they are doing me a favor and treated as if I am trying to scam them. Why is society like this?

Interviews work both ways. You are interviewing them just like they are interviewing you. They are doing you a huge favor in acting this way. Now you know you don’t want to work for them. This is much better than them pretending to be nice and you finding out later that it’s miserable.