Certainly there are some groups that are more negative than others. You may not have been exposed to it yet, but politics there can be terrible. Either politics between groups (often working on similar/competitive technology) or within groups, where people jockey for stack rank. MS "grades on a curve" so there's always a winner and loser, regardless of how great your team is. This sets up a very bad intra-team dynamic and it's been one of my principle complaints about MS since I left over 10 years ago.