What are your benchmarks of rationality?

Here's a big one for me: Whether or not someone shows a rudimentary understanding of how their own brains can mislead them.

It's easy enough to see it working in teenagers. They're the ones who realize that their emotions are going to be completely out of whack, their judgment may not in fact be 10x better than every adult around them, and proceed to compensate for it where they can.

It's not the same as knowing when to shout "Anchoring!" or "Sunk Cost Fallacy!". That's just knowing the password. It's a matter of being aware that your brain can think and feel things without consulting you, and not all of the things it thinks for you are good or right.

A necessary condition is having an intuitive understanding of how to properly reply to hypotheticals or thought experiments in a discussion. If someone keeps focusing on convenient possible worlds, they probably have a long way to go.

Having such understanding is not a sufficient condition for rationality, because many philosophy majors internalize these habits of thought, and I don't think that being a philosophy major is strongly indicative of rationality.

I was hoping this would be about judging one's own rationality. Judging others seems to be a lot easier.

Stuff that's just identification with an established subculture like New Agers or conspiracy cranks mostly shows that the person likes to identify with that subculture. It's a lot trickier to find stuff that you'd hope people to get right but which aren't strongly tied to a specific subculture attire.

Well, after the list given in the OP (which, while they are in fact necessary conditions for rationality, seem to me to not even constitute a "lowest standard"; they're the surface-level attributes that are adopted almost automatically upon entering into the sceptic community) I tend to use their reaction when I say "everyone should be immortal". Strangely enough it does seem like you need an abnormal clarity of thought to reliably come to the right conclusion about death.

What they do when they're wrong about something immediately available to them (so, reading a map wrong, not being wrong about global warming).

1) Why was this post downvoted?

2) I've realized that I take the far easier path: I simply downgrade my model of someone's rationality based on what I judge to be irrationality. The benchmark of a rational person is thus simply an apparent absence of such things.

For example, I notice belief in belief a lot, leading to confused minds: I'm thinking of one person who rationalizes incessantly. Or I may notice insufficiently clear thinking, often related to the use of passwords, along with the implicit disagreement with the creed that what the truth can destroy, it should. I'm thinking of one of my professors who clearly is opposed to reductionist cognitive psychology for what seems to me primarily wishful thinking rather than good reason, and approvingly notes that some cognitive processes can be 'emergent', and so on.