You don’t need to explain yourself for other people. It’s not necessary to provide a bunch of details. Say what you need. it’s not necessary to sit through someone’s rant about something negative or time consuming, you can end the conversation if you see fit. The idea of polite can be exaggerated in our heads and it takes up our valuable time and goes against our gut. Saying what you mean is polite. This is my goal for this year as a person who is always “protecting” people from my thoughts or opinions out of politeness (when they don’t even need it). It’s been hurting my flow of life and comfort of being around people.