My gf father always said you can tell what a man is like in how he treats and tips a waiter or waitress.
That behaviout speaks volumes about the character of a person, regardless of gender, and was responsible for a couple of women in my youth not ever being called for a second date.
That’s something my husband and I believe and have taught our daughters as well. The way one treats servers is a glimpse into their character....
That said, the blogger needs to get out of the delivery business as he apparently doesn’t have the character to accept with grace the lumps that come with the territory. While I’m sure he thinks he’s very clever and justified in what he’s doing, it’s in extremely poor taste and if he’s fired for “outing” the customers of the business that employs him, the firing will be earned.