I think pretty much the same response as you've had. Although being in my 30's the friends the same age as me have similar memories of retro systems and so want to play on them again when they see them. Same with old arcade machines.
Not so many know much about emulation and I've converted a few over to trying emulators out and getting them interested in it. Allowing them to relive and play the games from their youth.
I don't think I've ever had anyone take the mickey about retro stuff. Most think it is quite cool to see the old systems again and recount memories they have.