I have a prejudice against left handed people
Why do you hate left handed people?
I was drinking with a lefty and he made a mean face at my girlfriend and I was about to kick his ass when she stopped me and said it's not worth it
It's not nice to have prejudices against people, especially for petty things. You need to learn to relax a little.
I hate them!
If you must, hate the individual at least and not the whole group.  There's no reason to extend an incident with one person into an indictment of a whole group of people, that's just bigoted!