I think you'll find that out of all the pairwise combinations of language communities, there's one that stands out as having beef with a bunch of other ones. And that's not true of e.g. Haskell and OCaml (or to nothing like the same degree), so it's not just about competition for mindshare, it's about an approach to competition for mindshare.

The C++ community and the Zig community seem to get along fine, so it not about looking up at the entrenched thing or down at the new thing, many orders of magnitude there and no drama.

Python, R, and Julia folks all seem to get along.

On the frontend there are a zillion things that compile to JS and even in the big camp the frameworks are split 9 ways, you get a little heat here and there over Vercel throwing big bucks or something but it's rare, generally the Svelte people and the Astro people seem to not mind when the other one front pages or whatever.

Rust is at war with the world. Maybe it can even win but it's a weird road to walk by choice.