Very interesting! My immediate reaction/name for the feeling I had would be frustration. Your comment made me think about the possible connection between those two feeling and low and behold I quickly found this-
https://en.wikipedia.org/wiki/Frustration–aggression_hypothe...
Re:Show HN: Face Generator
by carrolldunham on Monday September 02, 2019 @10:33PM
(#20863297)
it made me angry too. i got the urge to jump on here and berate the creator for rationalised reasons. it's because the random flipping in response to your reasoned movement feels like an something between an insult and an assault
After switching off randomness I immediately felt calmer due to the smoothly changing faces.