Maybe that's part of the problem. Not that everyone is entitled to talk about their subjective experience, but that everyone feels entitled to talk about their subjective experience -- and many are socially blind and comically out of touch when doing so. That's where memes like "first world problems" came from...
Everybody should be able to talk about their subjective experience. But many should have the social awareness, grace, and decency, not to.
Those who disagree still laugh and sneer at the richer 0.1% people when they say something comically out of touch with everyday life. But they just can't fathom that they themselves can be a richer 1% of people for a huge majority, and that their complaints can sound comically out of touch to most.
It's not like there aren't real problems to complain about that are shared among people and don't make someone look like self-absorbed (health issues, family issues, divorce, financial trouble, trauma, and so on).
60+ hour weeks can really mess with your health, no matter what you're doing. I definitely have different injuries than I had when I did intense physical work. But working more than 40 hours is still not healthy. You're trading pulled muscles and joint stress for carpel tunnel syndrome and cardiovascular disease.
I will say that there is a significant reduction in stress and jump in wellbeing between 30k and 40k. Beyond that, there is very little actual difference. As my income increases, all it does is reduce my time until retirement.
Household income is not the same as one person's wage. The media household income includes tons of couples where both are working.
And while "income is not the same thing as wealth", still making 80k in income (not wealth) puts you at the top 13%. You get into 1% of USA is 300K.
As for the world, 80K (net) income put you at 0.1% globally.
I think this approach to suffering is problematic. Feelings are not a contest. When I talk about things that hurt me, I don't care if someone else thinks that I'm "self-absorbed." The point of expressing myself and being vulnerable about things I'm dealing with is not to make me look good.
It's to sort out my thoughts so I can better understand what I'm feeling, it's to connect with other people who understand me and can offer solutions, it's to find other people who are going through the same things so I don't feel like I'm alone, and it's to show other people who are going through the same things that they're not alone.
Expressing yourself to other people is healthy, even for rich 0.1% people. It only becomes an issue when it causes you to stop caring about other people or dismissing their problems as irrelevant. I don't see any obvious indication in this post that OP has done that. OP can simultaneously say, "this is a hard thing I'm struggling with" and "other people have it worse" at the same time. They're not exclusive concepts.
And not to poke fun, but the framework you propose is honestly just silly if you start to break it down: is it uncouth for the middle-class to complain about rising health care costs, given that many US prisons don't even offer adequate health care at any cost? Is it a problem for the homeless to complain about eating food out of trash cans when poorer people in other countries are mixing dirt into their flour? You mention divorce as a shared issue, but really that just shows how out-of-touch you are with the plight of modern sex-slaves in ISIS controlled territories.
.. unless they're recommending some action be taken, of course. And this blog post isn't. It's not a demand for policy, it's just talking about life.