To a narcissist, everyone they meet is a tool or a threat. If they can’t bully you into being a quiet, obedient slave who will do everything they want and help them look good to their higher-ups* (*”Kiss Up, Kick Down” is a motto written by and for Narcissists!), they’ll see you as a threat and want want to bully you until you leave.
Basically, the behavior of the Narcissist won’t change, either way. They will be ugly and mean and nasty to you either way. They want to either break you down until you are a slave, or beat you up, ruin you, or destroy you if you won’t ‘bend the knee.’
The only way to be a threat and have the narcissist NOT attack you directly is to be their superior within the workplace organization—if you are the CEO and they are a middle manager, they may work against you behind the scenes with gossip and smear campaigns, but they won’t attack or bully directly.
If you have a bully for a boss, the only control you have in the situation is to leave as quickly as you can. If you try and document bullying events and behavior to take to HR, you will likely find that HR is a pack of flying monkeys who will do whatever they can to protect the company from liability and protect that boss from consequences. HR is not there to protect employees, they are there to protect the company and the status quo.
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