Rust was often touted as a superior alternative to Node.js writing servers. Perhaps this element of contempt is no longer there but it certainly was there before due to the competition. Similar competition existed between Node.js and Golang and there was similar contempt from Go community.
In some performance-critical tasks Rust is doing much better than Node.js, but I don't see this as a contempt of the JS language or its community. Rust has made certain trade-offs for zero-cost abstractions and no-GC memory management, and this pays off in certain situations.
Async in Rust uses a radically different model than JS or golang, but that's not to say the other languages are bad. It's because Rust has different priorities, and needed an async model that works well without a garbage collector.
