There was some eejit living in my complex last summer whose car alarm went off about every five minutes or so between about 10 PM and 1 or 2 AM. That was annoying, too.
No, I feel very firmly that excess noise is rude. By "excess noise" I mean the motorcycles under discussion, car alarms that go off repeatedly for no reason, stereos that I can hear perfectly clearly from outside your car--and, in some cases, inside my apartment!--people with no inside voice, and so on. If the noise you're making is just for the sake of being really, really loud, you're either seven or acting like it.
"Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"
"You can't erase icing."
"I can't believe it doesn't work! I found it on the internet, man!"