Trying to get everybody to like you can override your ability to say what needs to be said and act when you need to act. Also, it is usually impossible to please everybody and by trying to do that you can easily turn everybody against you. Trying to get people to like you can easily impair your objectivity (as if there wasn't enough occasions for that), play favor game and get people to dislike you for playing the game.

Now, just because I don't like somebody or somebody doesn't like me does not we can't behave civil and discuss and try to resolve our differences. Or even agree to disagree but still keep cooperating on this and other matters.

It also doesn't mean I have to go out of my way to get people to dislike me. I am trying to be reasonable, fun, I smile and compliment and I try to find and expect good in everybody until I am proven wrong. It is just I try keep this separate from ability to think straight and cooperate with people.