Marty,
I learned something many years ago about people. Most just don't care about the results
of their actions.
I used to carry 16 penny nails in my handlebar bag. I would use them on the tires of the non-carring, it's all about me, I'm in a hurry and you don't count, Azzholes. Just put one in front and one in back of each of their tires. Made me warm and fuzzy all over! 
Mike

Hey I know I'm late to respond to this particular post but here goes anyway...
Yesterday I rode about a hundred miles to see a friend I hadn't seen in 40 years. We met at a popular little country buffet in a small town. It was Sunday right at noon.
I arrived earlier than his group and I parked the bike with plenty of room on either side. As I waited on the porch the time went by and the lot filled with cars. Soon a big white SUV pulled in and parked to the left of my bike, within a foot or 2 within "door swing" distance. Too close for me. It made me real nervous and a bit mad. Then all of a sudden another big SUV comes into the lot and parks on the other side of my bike. Yep, just as close.
Now I was mad. How could those inconsiderate bastards box me in like that with me sitting right there watching? They must have been trying to piss me off on purpose.
One door opens and out climbs a little old lady who proceeds to use her walker to go around and help her husband out, also with a walker. He's got a WW2 vet cap on and an arm full of vintage tatoos. The other cars doors open and out comes another pair of old timers, again a ballcap, this one from Vietnam. As they hobble onto the porch they all smile, nod and greet me. They all pause to ask me where I'm from and how I'm doing. All fresh from church services and happy to be alive on a beautiful day.
My anger vanished. My gratitude for the old guy's service was expressed and I felt ashamed for having bad thoughts in the first place. As we talked about my bike it became apparentr they had no idea they had parked too close. As soon as I told 'em it makes us nervouse when cars (moving or not) get too close they immediately apologized and offered to move their cars. No need now that you see it I said as I hoped they would be careful backing out. Lesson learned: Non-bikers don't have a clue about our conventions, unspoked rules, and safety zones.
Brings us back to whether or not someone is trying to piss us off or just doesn't know any better. The guy on the bike that parked too close may have been trying to line up so the max bikes could use the space, like you do at rallies. I've been to events many times where you barely have a half inch or less once you get yours stood up. I've been blocked before but I'm sure the other guy just underestimated how much room I would need to stand it up. Heck, I've done it myself.
Glad I didn't put nails out this Sunday.
Sledge