oooh... I've rarely hated coworkers in the past, though the ones I did hate I really really hated!
Most of the time my information collecting was done purely out of boredom- I find information about ANYTHING and ANYONE to be fascinating and therefore knew what any given coworker was up to at any time I never really would USE any of this against any coworker unless they backed me into a corner, and then I would use any resource or information that I had to get back to being in control of myself!
I suppose if I went all EVIL I could use the information that I know for wicked and manipulative ends though
Most people are horrified when they first meet me because I forget to think before speaking, but they usually warm up pretty quickly! It's apparently hard to hate someone who actually LIKES humanity!