@OP: mostly because there's no way in hell I'm going to accept being held to the impulsive standards of my fellow online gamers because they've frequently shown their inability to not sperg out at the drop of a hat.
They want a baseline, assumptive "standard" to expect from people, but that's never going to work because people don't come from the same backgrounds or acquire the same skillsets.
Historically the bulk of them have shown a habit of hyperbolic expectations, reactions, and perceptions of things.

...why the hell would I ever consent to being held to any of your standards, random elitists on the internet? why would I ever trust you to restrain yourself when concocting an excuse to not take groups on an individual basis? I don't have to clear high-end content. it's just another thing to do on the list. I can even play something else if I hit a wall. meeting your standards is as unnecessary as the content you want to police my performance in.