Abuse doesn't actually make people stronger. What helps people become stronger is overcoming adversity. You want people to challenge you and to run into obstacles to overcome, but people who are routinely abused just end up far more likely to have mental disorders later. Nobody is better off or "stronger" for having PTSD.

Toxic bosses, colleagues, brutal job interviewers are no where near as violent or persistent or inescapable as childhood bullies and if those toxic people did half the things kids do to each other they'd be quickly arrested and thrown behind bars.