...what your anger is is about tribalism...mine over yours etc...In all honesty we all get like that at times, either over something as small as a parking space or as large as denying an entire group or race (which is technically only a human construct to differentiate classes of people via physical features, yet we never call dogs of differing backgrounds races of dogs).

Whoever parked there did not ask you, but just took what he wanted. He intruded on your turf, and that's nearly always annoying. And he was a sulky brat when you called him out. You summed it up in one word: Jerk.

Your space is your space. Rules are rules. Having to personally enforce the rules we live by is always frustrating because we shouldn't have to.

Humans act very bizarrely with parking spaces. I don’t get the obsession to getting the absolute closest spot possible. I’ve seen people wait for someone to pull out when it’s much quicker to get a spot that availability a few spaces further away. I’ve seen this behavior in gym parking lots.

I’m somewhat of a young buck still, so I typically park a good distance away so people that may need closer spaces can have them. It’s OK. The extra 100 feet aren’t going to kill me.