No policy of shunning? Well that is debatable. I believe that one of the temple recommend questions deals with associating with apostates, or apostate groups. Anyone who leaves the mormon church is apostate aren’t they?
Now, when my cousin sent in her resignation letter, we encountered two ladies from her church/stake, whatever, in a store. When they saw us (they made direct eye contact), they turned around and went the opposite direction. Shunning? Probably.
Several weeks after that, we went out for lunch, and noticed one of the servers in the resturaunt was from her church. The server came to take our order, and the greeter came over and told her that we weren’t in her section. The server said, “I know, but X asked me to take this table.” X happened to be the woman from her church. Shunning? Absolutely.
You can speak of generalizations all you want, but these are two encounters that i experienced with her personally.
She has told me of other encounters, but since i wasn’t there, I don’t feel it is appropriate to relay them.
So, as you see, your comment about generalizations is not valid. Especially when you consider how many people on CAF, myself included have told of first hand accounts.