Almost every single project that makes it to the front page of HN tells you as part of the opening sentences what language it's in. For a good while it was "<thing>, (re)written in Go". There's nothing special or unique in the rust community about this, it's just what people in tech do.
The type of complaining you're doing is also nothing new, because exactly the same occurs under those posts when it's the language de jour. A few years ago when it was all about Go, you could look in the HN comments and see people complaining exactly the same way about Go and the Go community.