High school clique mentality
The team I worked for was very hostile and did not want to hear about their mistakes and failings, which was difficult as it was my job to find the mistakes that were made in the credit controlling process. There was an inner circle of pretty unpleasant people and you were either in or out, no middle ground. I have seen two people be bullied away in the time that I was there, and found it very stressful to try and deal with the people who had treated others so badly.
Perhaps other teams are nicer, but the one I worked for was awful.
Free fruit and cereal, and the good colleagues.