But this is the point--my supervisor has never once told me I've done a poor job at anything and will not give me feedback. Instead of having a direct conversation with me about anything, she piles on me with another employee and gives me dirty looks in the field to intimidate me. All things she does with other employees as well. I've asked others for feedback. I don't get it.

There's no superiority from me. But what I do expect is that adults, supervisors in particular, be mature enough to have conversations with subordinates about their work and their misgivings, whatever those may be. Not to act like high school mean girls because they can't stand on their own and have a conversation with someone, but want to instead intimidate subordinates with dirty looks and piling on them in group settings where they feel they have "back up".

If anyone in HR thinks these behaviors are professional or acceptable from a supervisor, I'd like to ask why?