Hmm... Honestly, I didn't think about this!
I think fake people are toxic, and toxic people are fake; I didn't think one can be fake but not toxic and vice versa.

Humans don't waste very much energy on people who they KNOW they like or dislike. Understanding that someone is not your friend (doesn't have to be an enemy) is way less stressful than being friends with someone but feeling unsure whether they're truly on your side.

When you're "friends" with these fake people that makes you doubt, you're constantly having to look for their actions, reactions and approvals, putting in enormous energy to decipher whether they are people you want to keep in your life or not, which exploits you greatly and over time.
These ambivalent relationships are the worst.