I don't see any reason to be rude especially when you can talk to them about their teachings, don't miss the opportunity. However I don't respect what they believe and I could never say that to them.
A JW who knew my husband years ago started writing to me and she keeps talking about her beliefs. I told her my family have shunned me for decades and on top of that their hatred of university would prevent me returning. She says she respects my feelings and knows I respect hers. How can a person who keeps ramming their religionn down your throat in every letter be showing respect?
So I tell her how I feel about the religion. She wants to pretend my family are isolated individuals and shunning me is wrong. I can't let her sidestep the issue, my family are following the Governing Body to the letter.
As ADCMS says most JWs don't know what their religion teaches and what we say goes over their heads but occasionally a born-in like me will see the nonsense for what it is. We keep trying to help them challenge their beliefs, sometimes it's wearing.