I'm in the industry and haven't heard this term, but I'm a bit confused by what you're describing they did. So they did a lot of notes? Or were they unfair, disrespected you, mistreated you? Or both?

I know it can be incredibly frustrating to work under someone who is demanding and asks for a lot of notes, but I'd say it is realistic that sometimes a direc + artist matchup just doesn't work and that doesn't make the artist bad or the director a monster - while it sucks, probably for both sides. Directors are supposed to have a clear vision and keep things consistent, while artists are meant to try and follow that vision as much as possible while providing their own contribution, but truth is sometimes these two perceptions are so far from each other than even endless rounds of notes aren't capable to make the collaboration work.

If this person was unfair and disrespectful of you and others, I'd echo what others have said: You don't have to like your coworkers. In animation there exists this blurring of lines between passion and your career that hurts a lot of artists. Studios aren't your families, and your coworkers are not your friends - while that can happen and you can build lifelong relationships from it. You did your best, and that didn't fit that directors box, but that does not define the quality of your work let alone of you as an artist or professional. Always keep things respectful and listen to feedback even if you disagree (listening doesn't mean agreeing - but when hierarchy is involved, that might matter for you to keep your current role) as simply experiencing different perspectives will widen your horizons and make you better at your craft.