There is a shared experience that becomes a common ground among riders. When you ride every day, you come to know the other 'regulars' you see on the roads. At first, you exchange the same wave that most riders exchange, but after weeks or months of waves, on the same roads, those waves become something more. Eventually, you bump into each other at a stop somewhere along the way, the gas station seems to be a common one for me. A quick chat, and a shared bond of being crazy enough to ride no matter what the weather is.
Somewhere along the line, you get to put names and faces to the bikes we see on a daily basis. Red DL-1000 becomes Dave from the tire shop. Skull and Crossbones face mask with a pony tail becomes Emily, an ER nurse. You get to know the people and not just the riders. They may choose different bikes, but in the end, we have all chosen the same experience, and that does more to cross the boundaries of the type of bikes far more readily than the weekenders that spend more time talking about their bikes than actually riding them.