It’s just a book. He’s taken it a direction that decreases his audience. It sounds like he’s probably published and sold enough copy to be able to be picky about readership. You’re welcome to not purchase this material. He’s also welcome to write and publish it.
Otherwise, I think he could have tried to depolarize his examples or take them a more light/comedic direction. Maybe a “murder count” to classification switch clause with a silly Megadeth reference. If it fits the criteria, then put in the wc procedure, etc. there’s always a way to spice up examples without being outright biased.
To be fair, if I'd been writing about PL/SQL - which is possibly the worst language ever conceived - for as long as that author had, I think I might start to go a little mad with the examples after a while as well.
Otherwise, I think he could have tried to depolarize his examples or take them a more light/comedic direction. Maybe a “murder count” to classification switch clause with a silly Megadeth reference. If it fits the criteria, then put in the wc procedure, etc. there’s always a way to spice up examples without being outright biased.