When I'm depressed I just don't have the energy for people unless I'm really close to them. It's not that I hate people or don't like the individual, I just don't have it in me to make the effort. If I'm hypomanic and avoiding people it's because I've already been talking to much and freaking them out, or so angry I just say really horrible things. If I'm psychotic then it's because they're out to get me, sometimes I find ith ard to speak, and I can't trust people/have other things to worry about like they could be possessed etc.
Normally though I'm just bad with people.