I was gonna say, this is a very Pittsburgh thing to do, and I didn't care for it when I lived there. The problem I had with it was, you'd only really see it in neighborhoods where someone wasn't probably going to park and stay forever anyways. Visiting a friend, food delivery etc, I literally had to move a chair once so we could park somewhere for like 20 minutes. It all stunk to me of "this is my street, stay away" mentality, and that's pretty disgusting.
I also didn't care for what I called the "yinzer doorbell" - people double parking in the street who were picking someone up for work/whatever, and instead of perhaps calling on their phone, or walking up and knocking on the door, would just sit there and lay on the horn until the person came to the car. 2 minutes, 5 minutes, 10 minutes, didn't matter. I was told by several Pittsburghers that was a totally normal thing to do, and that I was weird for thinking it was weird. Heaven forbid I'm not the one who needs the ride and's trying to get some sleep or whatever, yeah?
I don't know that I would call a friend an asshole over either of these things, but I definitely fall towards thinking it's a bit of asshole behavior if you're being stingy about these things.