Code quality can be a religious issue for some people, and some teams have somewhat strange ideas on the subject that they've agreed to agree about despite the ideas not being reasonable or valid.

Perhaps Bob was an engineer with a long record of success in other teams, who was surprised and justifiably defensive when his colleagues weren't happy with his work and demanded he do things differently for vague reasons that didn't make sense.

He's probably much happier now that he's in a more compatible team. Perhaps he's the guy in the photo.