Steve explains why people undermine others' success. It's rooted in social comparison: we feel better about ourselves by putting others down. Close family and mentors are usually supportive, but many friendships contain subtle sabotage where people dismiss your ideas to protect their own self-esteem.
Chapters
You mentioned that a negative human trait, never want to see other people succeed. Did you ever encounter people that purposely try to block you or make your life extremely difficult?
People want to feel good about themselves, and one way is if they put down other people or don't see other people succeed. When you ask them, what do you think about this idea? You've probably done a bunch of research on it, and you're asking somebody who knows nothing. Their opinion is going to be negative. That's ridiculous. That's a stupid idea. I'm not talking about your close family members, your professor. They want to see you succeed. But just generally, I'm talking about in social circles and friends, they're not going to be obvious about it, but deep down, it's always how you're going to make yourself feel better comparing yourself to your peers.