Asserting boundaries with people are important, however, how you assert them makes a huge difference.

If you're rude about it, and disrespectful, why should they respect your boundary?

We are responsible for teaching people how we wanna be treated.

I wanna be treated kindly, and respectfully, so when I set a boundary, I do it kindly and respectfully, because I actually wanna be in relationship with this person, but I want the relationship to feel and be good.