John Gruber joins a long lineage in assuming there was deep thinking behind any of George Lucas' Star Wars decisions. In this episode, he thinks there is some undercurrent to Star Wars where the underclasses hate droids and thinks it's a parallel to our modern era where people are hating AI. In truth it's more likely George Lucas was like, "This is supposed to be a seedy underbelly, someone needs to act like a racist, what can they be racist against? Oh, the droids, nice, let's do that," without any thought behind it past the surface level need to have something a little colorful happen.
A little googling confirms this, plus the retconning that people hate droids after The Clone Wars happened. John Gruber is also totally ignoring the fact that Luke's own adoptive parents used droids and they were moisture farmers on a seemingly impoverished-in-general world. Also, obviously, droids don't consume food or drink so they would just take up space that doesn't make money in a cantina.
Anyway, just John Gruber proving again that just because you write a blog about Apple products, that doesn't mean you are some kind of genius who even bothers to google his theories for confirmation before proudly writing about them on the internet.