0)I just wrote the equivalent of a three page essay. I deleted in though, so there's that.
1) I have this tendency to want to sort people into lists based of demographics, psychographics and hobbies. Then I could compile some sort of database. That way, I could use the search terms "single, gay, camping" and I could have a list, and it would be so easy.
2) Getting to know people takes so long, and it's always disappointing if you end up not liking that person. It's like all that work was for nothing.