Ain't no shunnin' like a J-dub shunnin' cuz a J-dub shunnin' don't stop.
So when you see a dub leavin' no matter the reason ya gotta give the dub his props.
So far I've experienced the "insta-shun", which occurs when you do something out of the ordinary that they've been told is wrong, even though it isn't so wrong that the congregation would act. No need to think, just shun, now, now, NOW! Still, shunning as an instant default is quite the protection.
As soon as my DA goes through, I'll then get to experience the "perma-shun", which never ends and is enforced by peer pressure.
There were lots of things that I "fun-shunned", things like getting too involved in sports or watching movies with any type of magic in them. The "fun-shun" is effective at avoiding any pitfalls in life because they always come with a side of fun. Get rid of fun and you can avoid doing something resulting in an insta- or perma- shunning later.
Ah shunning, such an easy way to put things in their respective places. You don't have to think, just act in avoidance so as to never be in danger of using your mind or conscience. Really a useful tool for those who are desperate to be "good enough" in the organization and who want to save their lives by avoiding problems. It worked really well for me until I started to pair my mind that always had some questions about things with my emotions that moved me to really start investigating and take issue with things enough to get out.