I also don’t think it’s standard or taught anywhere, but I do this sometimes too. For me it depends on the cup shape and whether I expect it (or my hands) to be slippery. If it is plastic, or has no condensation, or isn’t too full or heavy, or is wider at the top that where I’m holding hit, then I don’t do this. But a large, thick glass cylinder, full, with a cold beverage on a hot day, then definitely.
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