if you sulk and act like a sullen loser when someone asserts a boundary you’re not actually respecting their boundaries, basically if you make things unpleasant afterwards you’re creating an environment where people feel they cannot say no to you or assert themselves

This should be taught in every middle school health class

Seriously!  Also civics, gym, and business classes.  Good boundaries make good lovers, but they make good regular neighbors, teammates, clients, and colleagues!