Again, what about people who cannot have dairy? Or, how about a mistake I made when we had our café and I started making a latte with almond milk instead of soy. When the customer saw me pooring from the wrong carton, he rather excitedly told me I had the wrong milk.

He was rightly worked up because he had a deadly nut allergy. I could have killed him if he hadn't caught it. He wasn't being a Karen or dick. He was fully justified in his urgent response.

And, I profusely apologized and made his correct latte. We also started storing the nut milks away from the soy milk – all those cartons look the same when you're in a rush. His quite reasonable complaint led to safer procedures for all our customers.