Yes, yes, and yes!
That's the main reason that I hate not having a DX is because I have to defend and explain why I need to be so careful. I also hate all the stuff circulating around about gluten free fads and so on, so forth. Because then people perceive that if you don't have a DX, you've jumped on the fad bandwagon.
I would give almost anything to have a "real" DX, but I wouldn't do another gluten challenge for a million dollars!
There are a lot of psychological and social issues surrounding having to eat this way without a DX, that's for sure.
Exactly why I think Paul's idea has merit.
I don't see it as excluding folks without a celiac card -- I see it as a place where we can talk about these frustrations without giving the entire back story/status.