More than once I've met someone and have thought "wow, I have nothing in common with this person and no interest in getting to know them." Not aggressively anti-those-particular-people, just no connection.
And at least three times I've known the person was destined to never be a pal, I've been entirely wrong and I've ended up with three very good friends.
Come to think of it, at least once someone I really like now first had to move from a "ugh, no way do I want to get to know this person." to yay, friend!
First impressions can be bogus.
That's all. No biggie, just something I was thinking about. I like remembering how wrong I was in those particular situations.