I think SLRs attract more negative attention, whereas TLRs attract more positive attention, when people notice them at all. I've seen the hostile stare directed at SLR users far more often, and have had people actively duck out of the way of what they think is what I'm photographing. Shooting with my Rollei, I've never had a negative reaction, just lots of smiles and enthusiastic comments. Out shooting with the large/ultra large format stuff, that really draws a lot of attention and I often spend as much if not more time explaining about the camera and doing demos as I do taking photos.