This is a simple question which for me has a complicated answer. I will say it depends on the circumstances. If the Witness I'm thinking about is an elder, I want absolutely nothing to do with him. The same goes for those in the upper echelons of the organization from circuit overseers clear through to the Governing Body. I tend to regard most ministerial servants as "harmless personages", to quote Civil War veteran Sam Watkins.
I know a few Witnesses who still talk to me and have maintained our ties. For the most part they respect my decision to stay out of the organization and all is good between us. As for others, I have to look at them as individuals. I have tried to reopen my relationship with my best friend. Our friendship is currently in limbo and I will leave the next move up to him. Today I wrote to a Witness and his family who had just suffered the death of a near relative. There are some Witness doctrines I still believe and the resurrection is one of them. I wrote to extend my sympathy and remind them of a common belief we still share. I doubt I will get any response, but one reason I did write was to demonstrate that Witnesses don't hold a monopoly on human kindness and decency. Maybe a sympathy letter from a disfellowshipped person they once respected will make them think.
Should Witnesses come to my door in their field service work, I would greet them kindly and courteously, but would also let them know from the start that I am disfellowshipped and will not be returning. However, if they want to discuss spiritual matters in the spirit of mutual respect, I will gladly invite them in for a chat. Other than than these circumstances, I plan to keep my distance. Yes, I do feel pity for those still trapped in this cult and wish they would get out. After all, I still have friends and family whom I love who are Witnesses. But I won't jump into the water to save them from drowning, especially when they can get out on their own as the water really isn't that deep.
What I really wish is that some scandal would erupt that would rip the sheep's covering off this hypocritical cult and expose it as the wolf it really is. However, I have little hope of that happening, and even if it did I think the mind control it exerts is so strong that many, if not most, of the rank and file would choose to stay with the WTS rather than abandon it. I hope I'm wrong, but from what I saw in more than thirty-five years' association with Jehovah's Witnesses, I doubt I am mistaken.