What signs tell you someone is dangerous?

A lot of Ns act exactly the same. What have you learned that you either didn't admit to yourself or didn't know before? Sometimes Ns try to brainwash you so you ignore your survival instincts. Some of the ones that are extremely alarming to me are these:

-Paying attention to everything you do (they are trying to copy you or steal from you, smear you or get you arrested) (nothing good comes from someone who is paying that much attention to you)

-Guilt tripping ("After all I've done...")

-Different over text vs real life (real life is where the evil energy comes out)

-Shark eyes

-Making inappropriate comments about your race (esp if it singles you out)

-You just feel it ( don't ignore it)

Insecure and envious people are the most dangerous. Esp when they're covert. They usually don't have any substance and will become anyone in different situations bc they don't have a core self. It's not that they were so traumatized that they deserve sympathy. Some people are terrible, entitled, abusive by nature. They know what they're doing and know when to shut their "narc" off. The punching bag gets the worst of it in private. I would rather deal with the loud ones but not dealing with any Ns is best.

EDIT: Wanted to add forcing pity on you. They think bc they're an empty void that you're not "good enough" either. This might go with belittling but it feels more like weaponized pity. Or like when they force you to accept a "favor". It always feels violating and coercive.

ANOTHER EDIT: Tired of N's creepy used car salesman scammer energy being seen as "likeability" and "charm" while being traumatized and dissociating and trying to survive is seen as being "unlikable". Too many people are selfish and blame those who aren't responsible.