Perhaps it was condescending, but it was, first of all, not intended to be malicious. I have had the luxury of having used a lot of programming languages for various projects. The first N years of my career, I used mostly C++ and Python. I didn't like Python much and was pretty convinced that C++ was the pinnacle of programming languages.
Since then I've done (real, professional, for-profit) projects in PHP, Go, Java, Kotlin, Swift, Rust, JavaScript, Elixir, and Clojure.
So when I work on PHP and Java I can feel what they're missing. It's simply the luxury of having experienced working in (what I consider to be) better languages. Clojure and Elixir were not my cup of tea, but I still find them to be better quality languages than JavaScript.
I have met many developers in my life. Some with quite a lot of experience. The VAST majority of them have only ever worked in a handful of very similar languages. Mostly the ones I listed originally (I forgot C# in the list, but that's more-or-less Java++). If I'd only ever used PHP and Java I would literally not know what a good type system looks like. It's ignorance, but not stupidity.
And I'm talking about people I have much respect for. People who I acknowledge are smarter than me. That doesn't mean I don't know anything they don't, though. And if they've only used PHP and Java, then I know some things they might not. That's all.
EDIT: Also, I'm not sure what Peter Norvig has to do with it. I bet he doesn't like PHP, either.