It's annoying, noisy, stinks the place up and is helping the planet go to shit.
I know there are worse eco-crimes out there, but there can't be many quite so pointless, easily avoidable and utterly self-defeating.
Worst of all, it's not a recognised bit of fuckwittery like littering or dog fouling, so I can't tap on the window and scream at the bastards or I will look like crazy cat lady.