Interesting.

From the other side I never thought if it as something hard to understand. Almost everyone has people who don't respect their time or that the relationship isn't as close in one direction as it is in the other. Think of a high school athlete or a pretty girl. Then there's the people who really want to be around those ever so slightly or momentarily special people.

Often the person who needs something from that relationship needs something that the "celebrity" person doesn't actually have to give. It is the non-celebrity who is saying that the "celebrity" is special after all. The "celebrity" is mostly just being themselves. So the non-celebrity both gives up some of their power to the celebrity by treating them (and not just their work) as special, and also tends to want that power back in the form of a certain sort of attention or acknowledgement from the celebrity.

It's complicated, and I'm just working this out as I'm writing it, but celebrities often feel that all these requirements and rules are coming from the minds of their audience yet it is THEY are required to play along. You're just dancing to the tune of others. Some really want to be a part of that dance, some don't. Some want it sometimes but then they also occasionally want to be left alone ... but to suggest that makes the non-celebrities pissed off. This is probably an unconscious reaction to the non celebrity realizing that they gave the celebrity the power to be famous in the first place.

The next step after the non celebrity begins resenting the power they gave away and wanting it back in the form of attention is stalking ... so people on both sides of the issue have to be careful because things can get weird and tragic quickly.

Not surprisingly this has been dealt with in movies quite a lot. Joker is a recent example but the Matt Damon version of The Talented Mr. Ripley is a better example. TTMR works because the character who is the object of undue interest or affection isn't a star of any sort, he's just a guy with a blessed lifestyle and a short attention span.