> one example where a lot of rationalists stop making sense is blaming challenges with dating on macrotrends and demographics when their own 'microtrends' of personal behavior, manners, and selection bias is the larger contributor to the issue.

Both can be true at once though. The rational person says: these are the facts, I have to work harder to date successfully. Is dating then still worth it? Some say yes, work harder, other say no, and give up. Those who give up says that society made dating too hard, not sure why you think that is wrong. You can call them lazy, sure, or maybe they don't value relationships highly, but that is hardly an irrational choice.