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.
I was thinking the same thing. It’s a bit whinny if you have to complain about every little tip that isn’t right. You are going to have people that are stingy and people who are generous and those in between. It probably all works out in the end.