Delivery drivers gain a lot of knowledge about the roads from driving around for hours on end every night. The driver has surely encountered many more cyclists from sheer mileage of being behind-the-wheel on the job.

They have a tendency to pick up on the nuances of driving habits, much like on a bike. The way drivers slightly drift in the lane for a right turn. You can tell if someone will roll a stop by the way they brake up to apex of the sign. Etc... Same goes for cyclists, which she has managed to lump in to one group.

Granted, it may have been misplaced advice but it is one of the more pleasant venting-episodes you could have encountered.