Earlier quoted context omitted.
You roll your lower lip over your bottom front teeth, bring the container to your mouth, and pour the liquid into your mouth while gently resting the lip of the container on your lip.
Girls need straws for lipstick, guys need straws for beards, elderly need straws for health concerns. They aren't "completely superfluous".
Some people are switching to metal straws, while some restaurants are using dry pasta straws (the pasta doesn't go soft as the drinks are cold).
There are alternatives for those that need them.