Part of the big appeal is the loudness of the bikes. I don't think I would want a harley if it was quiet....also if you don't like it because it's loud, chances are that you will not enjoy it and will hold negative connotations with it.

Granted there are assholes that like to knock out your side mirrors but loud bikes definitely make themselves aware of other drivers when their cross section visibility is much less than a car.

I would think that the more scorn you show for these bikers, you are just upping their own sense of glee.