I’d add that most of this is true with being vocal and assertive about nice things that happen with other people in the moment too.

Not sure I agree that lash out OR be a people-pleasing wimp are the only options. Assertiveness includes other concepts like diplomacy, observation skills, empathy, and doing the work on yourself so that when you open your mouth, your actual truth comes out rather than just some words you let yourself be emotionally triggered to say.