In my line of work we work with Boomers and Millennials all the time. The Millennials are a LOT easier to work with.
Me: Here's our standard procedure checklist - follow it and everything will be fine.
Millennial: Thanks!
Boomer: You don't need to do all that.
https://www.washingtonpost.com/lifestyle/advice/carolyn-hax-she-got-married-but-her-bank-account-remains-single/2019/11/27/1ac03f1c-0fc9-11ea-bf62-eadd5d11f559_story.html
"He says he didn't get two degrees to brown-bag it and drink coffee out of a Thermos."
Just make sure you have no more than 10 items in your shopping basket:
https://www.nbcnewyork.com/news/local/Brawl-Ensues-at-NJ-Supermarket-After-Woman-Accuses-Shopper-of-Having-Too-Many-Items-for-Express-Checkout-Lane-565512201.html