alt Hacker NewsI don't know why people say this. When I wore glasses I cleaned them with my cotton shirts for over a decade and they didn't get scratched up, at all. I don't see how cotton would scratch glass to begin with.
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They live in an imaginary world where no one ever cleaned glasses until microfiber cloths were widely available.
To clean glasses safely you basically need a soft, clean cloth. Cotton is totally fine. You could get away with a soft clean sponge, too. Or even a soft-ish piece of paper (which is what most disposable lens words are.)
Most believe whatever marketing material or sponsored "expert" advice is presented to them for "proper care", without actually checking. At least glasses clenaning is a harmless area - people do the same for supplements, diets, and all kinds of health advice too.
Usually it's not the fabric but trapped dust that scratches the coating when you wipe.