Erm, yeah. Exactly!
I like to complain.
In my defence, I've never touched another car before. I think it can be tricky navigating tight spaces in car parks, especially when you can't see actually see the tow bars. You can't see them because they are obscured from view at first by the adjacent car you are reversing beside, and then later because they are lower than your rear screen's field of view. So the only way you could see one is to get out of the car and look first. You try and park nice and tight (but not too tight), and then you hear the klonk. That's why I hate them!
It's a bit like those silly pillars that you sometimes get in car parks behind the spaces. If you don't know that they're there (because of other cars obscuring your view) and if they are too short to be visible in your rear view mirror, then the first thing you know about their existence is when you hit one. (Fortunately, this hasn't happened to me yet, but a friend was complaining about them at work today.)