For the manager not to be a manager as they are clueless and have zero people/management skills.
Treat others as you wish to be treated and for the older male managers not to simply be nice to the young good looking girls!
Start treating people correctly instead of what makes the management’s bonus better. Better still just don’t apply they all just lie.
Fire every manager there and start from scratch
Manage people, instead of bullying & humiliating them
Hire people in management who are mature, supportive and actually know what they're doing. not because they have friends higher up.
Start being honest with staff and stop being underhanded.