Sure, but if the windows are closed and you can still hear the car idling....if the car has exhaust mods and a quiet area at night time I can see how it can be annoying.. Again if it was 8pm way out of line, 11pm is a different story, why not wait till the next day.
But that's just me, I'm 32 going on 80 when it comes to respecting noise and my neighbours.