I have mixed feelings on what ya'll are calling "reversed shunning".
JWs practice shunning due to a mandate from the leadership. They don't have to know details or have an opinion, they just follow orders.
We, OTOH, have freedom of thought. We may have freedom of expression, depending on whether we're officially out or fading. Personally, I don't shun JWs as a group. To me that seems to be stooping down to their level to some degree. Don't get me wrong, there are some I do "shun". I want nothing to do with them. But it's based on my personal experience with that person, not on the fact that they're a JW.
There is something to be said about avoiding undue contact with JWs in general if you're trying to fade, or trying to come to grips with your internment in their system. Even then though, If I happen to find myself in a situation where I have to interact with them, unless it's one of them that I absolutetly have no use for, I'll treat them the same as I would anyone else that I see on an occasional basis. Not friends necessarily, but friendly and cordial. Having JW family, I do find myself in their presence and I can usually endure their association as long as they're cool. And I'll be cool in return.
I try to remember that the vast majority of dubs are victims, as we were, and they don't really understand what they're doing. Even then though, there's only so much I'll put up from them and there is a point where I will cut off association with individual ones who piss me off.