I mostly see non-Rust languages' communities on the defensive on HackerNews, not the other way around.

If you open any thread related to Zig or Odin or C++ you can usually ctrl-F "Rust" and find someone having an argument about how Rust is better.

EDIT: Didn't have to look very far back for an example: https://news.ycombinator.com/item?id=44319008