I'm on the other side of timalkin and maleficent, but not quite as extreme as your views. Most people are good people and if you give them the benefit of the doubt and treat them right, they will treat you with respect. That being said, you've got to keep your eyes and ears open. Throughout my years at college I've taken to really listening to what people are saying about others. Although a lot of it is a bunch of bullshit, there is usually some grain of truth involved.
The people who don't make good friends are fairly easy to spot. There is no set description of how these people act, it's just something you've got to extrapolate from the actions they have taken in the past. This doesn't mean you should treat them like shit, even if you want to, just don't spend any more time around them than you must.
I don't really know what to recommend except just pay greater attention to what's going on around you. Mainly to what people do and say about each other because it is indicitive of how they will treat you.
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