I passed a group ride of CF/aluminum bikes on my 86 520, at a pretty good clip. One or two of them even laughed as I whizzed by in the next lane over. Looked like a bunch of beginners all geared up on their first ride together. Bikes, helmets, and clothing all had that "just bought yesterday" look. I ride with a bunch of balloon tire and ratrod guys on Sunday mornings. The company is good, so I don't mind using my lower gears and "hang out"with them. One of those balloon tire guys can really get a good head of steam going, and he's no Spring chicken, hehe. A 50/20 is a 50/20, if you can overcome the 45-50 pounds of steel under you.
Once in a while a single rider will blow by without so much as a word, and I make it a point that they know I can at least pace them, if I can't pass. It's all in good fun though. They're usually on older CF Specialized or Trek bikes, or the typical 250 pound guy who just spent $3500 on their bike a week or two before. Nothing evil about it, just fun of a very high degree.