I realize this is not what people generally are referring to when they complain about the Rust community, but this is the part that annoys me.
Feels like every damn day I see people preaching the Good News of Rust, pointing to things as being the unique and sole property of their preferred language. Except those things have been around for ages, in other languages.
Memory safety? Invented by Rust! Algebraic Data Types? Invented by Rust! Funadamental FP constructs? Invented by Rust! High performance? Invented by Rust!
If instead they just said that they enjoy having all of these things in a single language, well great. But instead it has to turn into a preach fest.