Give one person you wrote off a second look. Some of your best people will come from that list.

First impressions form in a few seconds, usually out of something irrelevant: a bad day, an odd joke, a manner that reminded you of someone else. Then they get defended, because nobody enjoys being wrong, so an entire category of people stays filed under no. A few of them would have been your favourites.

Choose one person you dismissed and give them a genuine ten minutes. Ask something you would ask a friend and actually listen to the answer. Most of the time nothing changes, and occasionally quite a lot does.