Exactly this. I'm fortunate in that where I work now it's pretty rare: the culture is fairly collegiate and friendly, and there's a strong sense of "we're all on the same side". Other places I've worked every meeting has been an exercise in point scoring, which is incredibly wearing and - try as one might - the culture does end up influencing one's own behaviour.
You can obviously get preachy about how people should be stronger characters and not so easily influenced but the phrase "Bad company corrupts good character" exists for a reason. Unless you're Gandhi it's incredibly difficult for many people to resist the culture around them day in and day out without some positive reinforcement from the behaviour of others, especially when you're incentivised to do otherwise, and may be penalised for not doing so[0].
[0] The answer is, if you can, find another job. Not always an option, but a good idea if it is.
