What I often notice is that people enjoy sabotaging each other, especially when it comes to their career
They'd often recommend you the worst jobs, in hopes you'll take them so you'll be miserable and a “step lower” than them.
They hate seeing people succeed in better positions than them, or advocate for getting fair treatment,they generally get extremely pissed off once they see others wanting better for themselves.
I saw it back in highschool too. One of the students top of my class, excelled in sciences specifically, told her teachers that she wanted to become a doctor. One of them told her she'll never succeed, that she's wasting her time and she better go work at a restaurant instead. Last I heard of her she's in med school and doing great