Don’t you hate it when you are in the middle of an debate, you suddenly realize you are wrong?
Regardless of the curb being painted or not, signed or not, we are all still citizens going about our business. I said earlier that I too pull up in front of stores to drop off a passenger to run a quick errand, and if I am causing an issue with anyone, I move out of the way. By the way, I would never leave my vehicle unattended in any fire lane, ADA ramp, etc..
Why would some people have such an issue with this, and then go to lengths to cause the other person problems, i.e. photograph them, and then do whatever with that pic.
If you see someone causing another physical problems, or endangering someone, then sure get involved to an extent, but if it is allowed, or is accepted by most, then walk around the distraction and go on with your time.
In the mean time, try some decaf.