Yeah, I had some pleasant encounters with motorcyclists too. On one ride, I remember this, stopping for bathroom at a gas station, then when I was sitting down a curb next to my bike drinking water and a guy on a Harley pulls up to the pump, smiles to me and says "Great day to be on two wheels, eh?"
On many ride motorcyclists waved, gave me thumbs up, and said nice, friendly things if we stop next to each other.
However! These are the bearded and tattooed dudes on Harleys, lowridres, touring motorcycles, etc. I'm talking about, not the kids on sportsbikes. These, like SUV drivers, would buzz you whenever they can. And it seems there is a schism between these two groups too.