I've been confused by this too.
About a year ago I bumped in to an uber pioneer/MS at the store and he was very pleasant and chatty. Last week, my wife reported that she saw him and his wife at another store and they were just as talkative and sent home a "hello" for me.
I think despite the tightening grip of the governing body, some Witnesses just aren't having it. Especially when they know the disassociation/disfellowshipping has nothing to do with wrong-doing.