I've mentioned these things before, but they seem apropos once again:
In one congregation, although I was never once given an official explanation, I was not called on by certain elders. This happened even when mine was the only hand up. In an oblique reference that I know was aimed at me, the WT conductor said, during the study, that someone may give good comments but actually be an apostate.
Later, in a different congregation, I was asked specifically by the WT conductor to raise my hand so that he could see it. My hair was very long and I had a full beard (still do). I would go into full JW-talk-and-walk mode, quoting relevant Scripture and publication references, as well as relating field experiences.
I didn't feel the hypocrite; it was deeply ingrained as part and parcel of my life since early childhood. I hadda keep the gush factor under control, however. I'm an ardent Mediterranean and bounce off walls and innocent bystanders.