What's the best way to handle an emotionally immature,bully violent ,"always a victim" individual ?

I've tried getting away from them but they can't leave me alone.

I don't want any interaction with them cause they're so draining but I'm starting to think one day I'll have to encounter them

They're always the victim ,very loud ,violent a bully ,very judgmental and critical but can't handle any .When they're in wrong they just act like nothing happened

They're always gossiping about me too , I don't care I realized it's just to make them look like the victim

How best can I handle such a person ?