Once upon a time, women wore heavy, probably toxic lipstick that smudged and smeared a lot on cups.

Also, some people drink coffee, tea, acidic, and/or sugary drinks from straws for dental cosmetic or health reasons.

Finally, disability or convenience reasons.

Maybe we all just need to start bringing a titanium folding sporf and a metal straw with us wherever we go and do away entirely with some single use plastics and their substandard, compostable imposters.