I don't think you'd need to be DFd in order to conduct such an experiment.
In every congregation I ever attended, there were people on the fringes who were regarded with suspicion. No matter how hard they tried, no matter how great their meeting attendance was, no matter how well behaved the kids were, no matter how regular they were in Field Service™, some clique or ringleader in the congregation always managed to spread malicious gossip about them in order to keep them out of the inner circles. If you were part of the inner circle or clique group, you were expected to toe the line if you wanted to stay in the inner circle or clique group, which meant you had to participate in the subtle (and sometimes blatant) ostracism of the people on the fringes.
Those poor sods on the fringes are kept at arm's length, always hoping for social invitations to be reciprocated, or to be included in social events within the congregation. They think if they keep trying, keep sucking up, keep their meeting attendance and field service hours regular, always try to comment at the WT study, keep volunteering for Privileges™, etc., that one day they will be rewarded with acceptance within the inner circle of the congregation. No matter how frustrated they get, the Elders™ and the WTS keep reminding them that they are a JW, not for the social rewards, but for the spiritual ones, that no matter how other JWs abuse you, you are there to worship Jehovah, and that should be the priority, not being chummy with people in the congregation.
Some people go through decades of this kind of abuse. Maybe they're masochists or have a bit of a martyr complex. Maybe they don't really care about having social support from their congregation. I can tell you, though, from personal experience, that everyone has a breaking point where they decide they aren't going to tolerate that bull$h!t anymore. I came to my breaking point in March, 1994. I'll never go through that again.
