I generally let people go ahead if they are going faster than I like. One time I tried to keep up and it made me very nervous. It wasn't on a motorcycle though. Several years back I bought my childhood dream car, a used Porsche 911. I joined the PCA and went on a trip with them to an auto museum. We took back roads, and on some secluded stretches we were passing 120mph, this on 60mph roads. I never went with them again, not long after I had to pay $6000 to fix a clutch throwout bearing, the car was sold as well.