I have pipes that are pretty loud above ~4000 RPM, but pretty quiet underneath that. When I'm in a residential neighborhood I keep the revs low and shift early (it's less aggressive anyway, which is what you want if a kid or a dog could dart out in front of you). On the freeway and when nobody is around me I also keep it under 4000 RPM. But when I start feeling boxed in or I'm lane splitting I'll drop it down a gear to bump the volume of the pipes. You can see people recognize you're there, and that's the goal.
But yeah, those guys who blare their exhaust on bikes or cars are a-holes.
My pet theory: Unlike motorcycle riders, car drivers don't get the benefits of stereo positioning unless you are real close.
By the time people hear it, decide to look for it, place the location, react as required - you are usually on your way anyway.
Mind you, my home park is beside the driveway between two apartment blocks. I don't want to piss off 50 people I live close to, each time I come and go.
So I have a balance of requirements to meet.
I do often hear loud bikes lane splitting in time to give them room though, food for thought!
However, there are people who are the opposite.