Yep. Keep it short and to the point, so that you don't have to waste time being condescended to. If you're in a position to walk away, it's a lot better IMO. You get to start working on the life you want to live and not the one you are ordered to live.
And you can always remind them- they are the ones who are turning away from you. You have no restrictions on talking to them or having them in your life. They are the ones following the order to avoid you.