(Proverbs 18:17 KJV) He that is first in his own cause seemeth just; but his neighbour cometh and searcheth him.
First impressions can be deceptive. We have all been there, on both sides. I got it the other day. I would guess I talk to the custodian that cleans my room at school more than I talk to anyone else. I see him almost every day. You start being polite and eventually get to know people. I was startled the other day when he shared he had been told that I was narrow minded, opinionated and hard to get along with. He was laughing and shaking his head when he said it. He got beyond the first impression that was created by others.
It is a spiritual necessity that we give people a chance to show who they are, not assume. If you think about it you can come up with times your assumptions were wrong. Judging on appearance would seem to be a sin.
So? Give people a chance to prove their character. It doesn’t take that long.