Ugh I have a coworker like that too. It drives me crazy. Instead of working hard, he'd rather pay attention to what other people are doing and tattle on them when they slip up. He claims it's not tattling if they're actually doing something wrong. I wish people would realize that if every put as much energy into doing their job as they do in watching what other people are doing, they'd prolly get ahead much faster because they'd be noticed for their skills and work ethic. Plus if you have to trash others to get noticed then you probably aren't doing anything very worthwhile to begin with.