A lot of the time loud exhausts are justified as a safety feature, allowing other motorists to hear the motorcycle since so god-damn many of them have no interest in actually seeing them.
Other drivers are the biggest danger to motorcyclists. It is ridiculous how little they care about sharing the road. I’ve witnessed firsthand a biker go through the rear window of a car that pulled out in front of him. I damn near had a very similar thing happen to me personally, but I was lucky enough to be on a slower speed city street rather than a highway.
There are worse things. If you want to complain, complain about people listening to music at night club decibel levels, something that actually makes them a danger to others. Don’t bitch about people trying to protect themselves.