Is everyone (or mostly neurotypicals) capable of being two-faced even if they're generally nice-natured?
Sometimes I feel like my kind nature leads me to be two-faced, to please everyone. I am sensitive to people's feelings enough to like to be helpful instead of facing conflict.
Today at work there was a conflict between two coworkers that I'm both friends with. I won't go into what the conflict was about but to cut a long story short they were fighting over a task and I ended up caught in the middle, as I didn't care either way what task I was doing. Person A ranted to me about person B's arrogant behaviour and I listened and agreed. Then person B made me go to the boss with her to tell him about person A's awkwardness. So I had to balance my opinions to please both. I could actually see both of their viewpoints on the matter, but I still had to pretend to only be on person A's side when around him, and on person B's side when around her.
I succeeded, but isn't this what being two-faced means?

no, you can still be neutral.
2 fa Ed is pretending to like someone to their face and then being nasty towards. them behind their. back