I hate my coworker
That seems extreme. Why hate your co-worker?
I don't like how he eats, I noticed that people who eat like rats are unmannered and sick in the head.
It's fine to not like someone. You should only be friends with people you like.
What are you telling me. I don't care about anyones' feelings so I am trying to ruin this guy's life.
It's fine to not like someone but to ruin their life is excessive. You're better off just ignoring them instead of putting actual energy into ruining their lives.