If you don't like being shunned, shun them first!
If JWs approach you and start witnessing, act confused..."Do I know you? Do you actually exist?" or simply say nothing at all. Same with family members. Give them the silent treatment. What will they do? Run crying to the elders and say "I tried to talk to so-and-so but he was rude.."
They need to realize we do not want their fellowship. We're not on the outside looking in; they're on the inside looking out. If we try to talk to them they think we need them.