All relationships have boundaries, but people usually don’t state them explicitly unless the other person has crossed the line. Therefore, openly stating a boundary implies that the other person has done something wrong, and members of estranged parents’ groups aren’t having that.
Possibly of painful interest to those of you with family issues and crummy parents. This is mostly just quotes, but if you’re like me, it can be illuminating/helpful to see echoes of personal experience atomized like this. Obvious content warning for self-entitled parents saying awful things.