I find it all quite amusing actually.
I recently flew on an internal flight on a BA 732. The flight crew were really friendly - they let me have the jump seat for the whole flight, including t/o and landing.
However, when I asked if either of them read PPRuNe, the Captain started looking out of his side window and commented on another aircraft he could see several thousands of feet below, and the first officer just said, "Oh, I think I've heard of that somewhere - I'm not really into computers", before "remembering" some paper work.
But still, a great flight!
TPuk