Bumping other cars without a care is rude and demonstrates a certain ineptitude on the part of the driver, but is it worth getting wound up over? Probably not.
Where I live, it is impossible to keep a car showroom pretty. If I stressed about scratches, bumps, dings and dents, I'd never think about anything else. There are too many of us in too many cars, too much road work, too many big trucks and, the least of the concerns, people generally don't care about the property of others. That's not even considering the rocks thrown up that ruin your windshield, little junior flinging open his mom's giant SUV door and leaving its paint on yours as a special present, or the errant shopping cart. Sure, having your car beat up is frustrating, but being realistic and keeping life in perspective can cut down on the stress. Cars are meant for getting people from point A to point B. That's it. End of story. Like it or not, sky_driver's wife is doing that, in her own bumpy way.