Try your best to get a good night's sleep, but don't let these kind of "recent studies show" articles distress you too much. There are all kinds of harms in our environment holding us back from hypothetical perfect health, and there always have been.
If "us" is mankind and its history, the "always have been" seems off. There are traditional harms, like the risk of being bitten by a tiger, but most of those harms are recent, something we are not yet genetically rewired for.
And as we've learned about them, we've been living much longer and healthier lives (until recently in the US).
Guidelines are needed to make policies and sweeping decisions at population level, but shouldn't be taken too seriously at individual levels.
Your neighbor was insensitive and should be more compassionate, but it doesn't mean their QOL is worse than yours (arguably they were in better shape than the sleep deprived you)
I mean it kinda makes sense as well, biologically, that there's a bell curve of both duration and falling asleep hour. It's dangerous and limiting for a group of people to be asleep all at the same time.
It's immensely frustrating when people push for their opinion of what a good sleep schedule looks like. We can unfortunately still see it in our school system and I can only hope that at some point our policies start following the research.
I be have always been very sensitive about my sleep, but after getting a child (and suddenly getting lots of interruptions every night) I stopped caring and found out that a few interruptions a night isn't really that big of a deal if I don't let myself get agitated about it.