I don't know why I have to explain this. It's not in any way/shape/form more practical to carry more things with me when the alternative is that someone hands

I don't know why I have to explain this. It's not in any way/shape/form more practical to carry more things with me when the alternative is that someone hands me a disposable version of the thing at time of purchase. Not everyone carries a bag with them -- and even if every single person on earth had a bag it'd STILL be more inconvenient for those people to waste cargo space in the bag with a straw when the alternative of being given a disposable one at time of purchase is available. I feel like there is a misunderstanding of the word 'impractical' here. Carrying your own straws is a lot of things -- wise, prepared, ethically-conscious, whatever -- it won't ever be practical ( practical : of or concerned with the actual doing or use of something rather than with theory and ideas. ) until the much more convenient option of being given a disposable straw at purchase time and trashing it at the end of use is no longer available to choose.