FACE WHAT YOU FEAR

Do not shout about your boundaries. Rather, show them. Demonstrate to people what you don't tolerate by firm action, and you'll leave no doubt as to who you are and what you're about. Nobody can argue with a decisive action. The reason people don't respect your standards is because you only shout or nag about them. Instead of saying, 'You can't talk to me like that,' every time someone talks down at you, you simply execute the consequences.

Once more: face what you fear, and after that, you're free. Imagine your life if this person walked away, and once you mentally prepare for it, you'll no longer be scared of it.