Sounds like you did the right thing.
I would have done the exact samt thing given the situation you described.
I was going to work the other morning, and noticed a bike in front of the car in front of me. We got to a curve, and he pulled over so he could fall in with me. Looking back, he might have been just looking for someone to ride along with, but I figured he was examining the awesomeness that is the FZ6. It was dark, so I didn't really check his bike out and can't tell you what he was on.
I let im ride along behind me for a little while, and then when we got to a passing zone, I dropped a gear and hauled major ass passing the slowpoke car. I turned right at where the road ended, and he turned left. I never saw him again, but I feel I demonstrated the FZ6 sufficiently since he got left WAY back there in a hurry.
On really curvy roads, I like to fall in line with groups and sort of tag along. I did it a couple times behind some hog-types, and even stopped to take a break with some of them once. They were goofing on my "little bike", and some began making the classic yet unfounded "Harleys are better" comments. I rode with them for a little while longer, and when they started to "get on it", (funny, because even the 1200s seemed slow to me,) I dropped a gear and SCREAMED past, eventually losing them completely. I would say I put a mile between us in very short order, because the stretch of road I chose to pass them on was well-known to me and great for a superbike burst.
-Suckers!
A couple of them had their WIVES riding 2up, and I had to laugh at these so-called "rebels. Hahaha... Go ahead and wear gay leahter chaps, go ahead and use a com-link to listen to your old lady yammer in your ear for the whole ride, and feel free to be a conformist to the Hog mediocrity, but don't ever call my bike "little" or insinuate that because my bike is made in Japan or lookslike a crotch rocket that it is somehow less of a bike than your POS chuffer.
If anything, it's way more bike than a Hog could dream of being, especially when it comes to eating up roads!
It is far more common to find riders willing to "adopt" you than not, and usually in a friendly way. I say if they don't ride at your pace, either let them go or find a way around them, but do so safely at all times.
Be respectful, even if they called your 600cc gem "little", lol.
If you do this right, they can sit there and smell your fumes while their wife tells them to "slow down, honey".
Hahaha