I think when you visit a general BMW club, you'll find that most of the people have bikes of recent vintage. That's just natural. And it's also natural that people will chat with others that have the same or similar bike. Little of the items that fit or are useful on an R65 work on an R1200GS... or S1000RR.
There's a thread going on over at the BMW MOA forum about "Changing the Guard", where the guy who started it noted that at a largish rally this spring (the Blitz to Branson), there was not a single airhead bike in attendance and the oldest bikes were 90s oilheads. (Still as much as 17 years old, the original R1100RSes are not spring chickens any more. We have to face up to the fact that our 30ish year old bikes are getting to be vintage vehicles. In fact, if you happen to see the VJMC - Vintage Japanese Motorcycle Club - at a show, you'll see that our bikes are as old as nearly anything they're showing!)
If you're like me, somewhat introverted, it can be a chore to strike up a conversation with a stranger, especially when there's not too much in common to chat about. ("Nice riding weather today, eh?"

) Naturally, here in the safe confines of the R65 forum, we have a lot to talk about.
The combination of factors above can lead people to feel that they're being ostracized when it's just as likely that people on the other side don't have much to share. If you stick it out a couple more meetings, I'm pretty sure that you'll find at least a couple people to share breakfast with.
Although I have the luxury of choosing from a variety of BMWs from pretty new to pretty old, I love riding the R65. A group of friends come down to my house in July each year from Seattle, to go to the MotoGP at Laguna Seca. They're on a variety of modern hardware, all of it with 100+ HP. I led them a merry chase around the hills here, and although I got a lot of good natured ribbing about riding the R65, I told them to just let me know when I was holding them up... it didn't happen.