As others have said here, what is interesting about JWs, is that there is a second layer to every JWs, that is unknown until you press the issue of TTATT.
I've known some JWs that I was fairly certain they would reject any conversation about criticism of the organization, but once they realized I was a critic myself, they let their guard down, and were willing to discuss it.
Conversely, I've met some JWs that i knew were up to no good, even having one of those double life situations, but when confronted with criticism about the Org, reacted as if they were part of the Governing Body.
You just never know. In my opinion, it all depends on whether that person has given some thought to the issues themselves. If they have, even if they kept it to themselves, they generally are willing to listen to someone who has done the same.
Another thing i've noticed is that for those who reject a discussion about TTATT, you should try again sometime later, because although they reject initially, it sometimes leaves some questions in their minds that they are curious about.