Is it normal to be a judgemental asshole?

I feel like an asshole for judging people and I don't know if I can change.

I don't judge people unless I know them, and I wait until after I have heard all sides of the story to make up my mind about someone. And sometimes, I find myself very strongly disliking the person. Even after months spent getting to know that person. Then I find that I don't like them. This doesn't mean that I act in a negative way towards that person, not at all, I act the same, but I am not as enthusiastic to see them as I was before I made up my mind as to whether or not I really knew or liked this person. Or I will just avoid them (slowly let the friendship die down, talk less here, text less there, I am socially pretty tactful).

All my life I have been told that you shouldn't judge a person before you get to know them. So I don't. I have common sense (he looks angry and dangerous, avoid), but still. As a result, I have had a VERY diverse group of friends ranging from devout Christians to strippers to cholos to hippies etc. I get to know them, THEN I judge them, but I was not told what to do if I came up with a negative judgement (which doesn't usually happen, but still). If I don't want to take the time to get to know them, I don't judge them.

Not to say I don't indulge in some gossip every now and then about people I don't know. Sometimes I feel that it is just to validate others when they are emotionally fragile, as "keepin it real" is stupid as hell to do in every situation. Take for instance, my friend's baby daddy left her. I don't know him, but I will still agree with her that he is an awful person. I know nothing of the situation, and won't get in his face if I ever see him or even bring it up. That.

So is this normal? Is it ok to get to know someone and decide that you don't like them, even though you have faults as well?