There are many professions in which the ‘layperson’ seeks ‘advice’. In some cases, they are trying to prove they know more that the professional, in others, attempting to get confirmation of their nonsense.
When approached by a questioner, the first thought should be;
“How did this person know I would be at the supermarket now?”
As soon as that thought manifests, your response is to look concerned and to tell them to come to your office.
If they keep babbling, move off, even if it is to hide in a bathroom, just get away.
These are time wasters. They exist to waste your time.