@poopie:
The Constitution binds government, not private institutions or individuals - “Congress shall make no law....”
That is, you are allowed to purposefully shut someone out of your life. That might make you a jerk, or it might not (maybe you consider the person a jerk). But in any case, people have that right.
In the end, this boils down to your family. The rules of the group were set out long before they joined. They have the right to speak with you, to invite you over, to eat with you. They just choose not to because they are convinced their religion is right and you are wrong. They chose the religion over family. They are convinced God wants it that way. Don’t take away their agency in this.
Also, we should minimize OUR own agency in this matter. We made our choices. At one point we all got baptized. If you were a minor and made that choice, can you honestly say that you didn’t see and understand what disfellowshipping really was? Can you honestly say you didn’t witness first hand the consequences of leaving?
And more importantly, don’t run to the government, feeling hurt, looking for blood, and advocate for a legal precedent that undermines freedom of association.