When Everyone's a Vampires or a Toxic Person

The problem with meeting people and not being able to read them is that you can't talk about your life, at least not the personal things or the details.  You can't because, if they turn out to be vampires, they will use everything they know about you against you.  They will try to insult you and blame you using that information.  They will spread rumors about you.

They will try to put you down, trivialize you and your life, or just plain ignore you.  The less they know about you, the less they can pull.  And, the more you feel a need to hide yourself.

Unfortunately, there's a huge chance that anyone you meet is a vampire.

Everyone knows how to act nice when they first meet people. Vampires seem friendlier than others.  They quickly slip into your life.  They'll seem really social, yet they don't have a lot of friends.

Almost any new friend ends up on the vampire watch-list.

The minute someone lies or starts talking shit about people, they're on the watch-list.
The minute something indicates that they're out of touch with reality, have too strong a sense of arrogance, or have an unrealistic sense of confidence, they're on the watch-list.
The minute they have an excessive sense of self-pity and talks a little too much about how everyone's wronged them, they're on the watch-list.
The minute they start denying the obvious, they're on the watch-list.
Anyone who bases their sense of self or of others on status or superficial things without any respect for a person's character or individuality, they're on the watch-list.
Anyone who snaps easily or is quick to blame others or quick to get defensive is obviously on the watch-list.

That puts a lot of people on the watch-list.  It puts maybe about half of all people (rough estimate) on the watch-list.

Vampires can't even pretend not to be vampires because they need to act a certain way to get any satisfaction.  They can't fight themselves.  They can be nice to be around when they first meet you (and this can last for months), but at some point their true selves will come out.