By the way, everyone mentioning glass vs metal and hot vs cold is ignoring a Taz (Shach) in Yoreh De’ah that says you need separate cups for milk and meat because sometimes some Mamashus of food gets left on the cup from your lips. Pashtus is that nowadays when we clean our dishes much better it’s not so Shayach, but it definitely is something to keep in mind and be Machmir on if you can afford it, especially if you don’t put your cups in the dishwasher.
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