This is a big loss for Nvidia because he was kind of the face of their marketing. Besides Huang, people were most familiar with Tom and people mostly had a positive image of him rather than the polarizing Huang.
Petersen and Huang are opposites in terms of personality, where tom seems like beta person, who follows the leader but is easily bullied. This is reflected by his stage presence when he shares the stage with Huang and his shy demeanor. Huang seems like a guy who tries his hardest to be an alpha. This is reflected by his overconfident statements and his flashy dress and trips to the gym. However I think he's was originally a beta which makes him insecure when things don't go his way. This can make the person a bully which is reflected when Peterson and Huang shared the stage together. Whenever there are problems with his tech demos, this insecurity shows. He always just seems so nervous and you can tell someone is getting hell after because he feels humiliated and needs to blame someone. If you want to look at the personality Huang wants to emulate, it's Steve Jobs. Jobs was famous for being a jerk but seems like a true alpha unlike Huang. This was reflected by his confidence even when things didn't go his way and his ability to carry a strong presence without showing flashy clothes and going to the gym to show off his figure.
Back to Peterson, I think the reason why he left is because mostly money but also because he was tired of being bullied.
I think Huang seems like a guy who is nice to most of his employees particularly his low level ones because he wants everyone to like him which is reflected by his high approval rating from his employees, but put him in a situation where he's around powerful people or on a public stage and he shifts to this fake alpha personality because he wants to put on a strong image and be one of the cool kids. Anything that conflicts with this image makes him lash out and since Tom was around him during these events he was the recipient of these moments.