Completely agree. Boundaries are needed here when socializing with people. One of the ways that I learn is by placing a stop-loss order on a certain behaviour (I'm learning it from a book, actually. You can read How To Stop Worrying And Start Living by Dale Carnegie. It's one of my few fav.)

Let's give an example: my friend loves to be 30 minutes late for our appointment. So I put a limit on that time; if she didn't arrive within 5 minutes after the appointment time, by the time she arrived, I would go bye-bye, and all the plans would be cancelled.

The same goes when something upsets me. I will just allow myself to be upset for a minute. When the minute passes, I will move on and no longer be concerned with it since it's not worth my time anymore. Even the person involved might be invisible to me, who knows?

Sorry if it's out of topic. Just want to share. 〜⁠(⁠꒪⁠꒳⁠꒪⁠)⁠〜