I've been on hte other end of that conversation. On a business trip to DC, I was waiting around for a few hours before my flight home, at park on the banks of the Potomac River. With just my little K100d and kit 18-55 (traveling light) walking about, I ran into one guy with a really nice Nikon rig setup waiting for the right light on hte monuments across the river. We had a very nice chat about scenery, settings, and getting good shots. He took a look at the shots I had collected on the K100 and liked the results, just as I liked the shots he had gotten. Nothing disparaging was said about any branding...
I think a lot of it depends on how *we* start or respond to others. Good interactions beget good responses, bad begets bad.... Just my $0.02
Jim