I can't really remember if I ever actively shunned anyone. If I did, I beg their forgiveness for my ignorance and rudeness.
But NOW I don't think I could shun a DF'd person, unless it was someone I hated all along or if they were someone who derserves to be shunned (not because of any religious edict, but a social one) like a child molester or rapist or something like that.
Then again, if they were a molester or rapist, they probably aren't DF'd and are currently appointed and/or annointed.