As a general rule, you should try to be friends with your co-workers. But there are exceptions. Sometimes, a co-worker’s personality or habits can damage your production – and make management view you negatively.
This article by ForbesWomen lists nine types of “toxic” co-workers. They include The Big Mouth, The Chronic Downer, The Flake and The Underminer. At work, you should be on the lookout for people who could derail your career.