That hurts. Just goes to illustrate the moral and ethical bankruptcy of those afflicted with the disease of liberalosis. I'm sorry for your loss of communication with your son, but I'm even more sorry for him. He's chosen to stick a poison needle in his arm, and has intentionally infected himself with a lethal mindset.
I have close family members who've done the same, and all I can do is remember them as they once were. I don't even know the people they've become.
You said exactly what I have said a thousand times. I love the children that I raised, but I don't know where they went. I can sort of understand the girl because she spent her youth in college and then became a professor. The son, has no excuse except he hangs around with artsy people.