The world has a lot of different standards for a lot of things, but I have never heard of a place with the default screw thread direction being opposite.
So does each language have a fun mnemonic?
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You have to have a convention about Up to usefully describe a rotational direction at all. I don’t see how that’s relevant. Left implies an Up.
Yes, it’s true, you do. Left doesn’t really imply an up so much as it comes as a package with one, though. I’m not OP, but historically I had the same issue. I just didn’t automatically jump to “in is down, and I’m on the rim”, and instead was thinking about my actual physical left and right at that moment.