I respect other people’s boundaries because I don’t want to cause them harm.
I’ve noticed that people who walk all over your boundaries, have extremely rigid boundaries. They are protecting themselves against “people like them” and will reprimand you for the slightest misstep. They aren’t worried about causing you harm, they are only worried about themselves.
You can learn a lot about a person by the way they are treating you. The hard part is figuring out that what they say and what they do is all about them and not about you.