No to negativity.
Harboring negative emotions towards another human being will never benefit you. All it does is waste your time and effort on something trivial. Therefore, if you come across a disagreeable person don’t even spend the time being mad. Just remember what happened and if it’s someone you regularly interact with be as civil as possible. There’s no need to try to be their friend. Know that although you can’t get along with that person that does not mean you can’t tolerate being around them. Sometimes it’s good to practice tolerance. You can also just try not to cross paths with the person. Hatred is unnecessary. Why worry yourself with things that don’t matter when you can spend that time being happy and grateful?