The hate is at least partly because there is and has always been a holy war over programming languages. Your choice of programming language greatly affects me. The software you write in language A (usually) can't interoperate well with the software I write in language B. You end up with duplication of effort and many implementations of a thing, one for each language, usually more than one, with differences between them that makes things complicated. You have more choices when there are more languages, adding complexity to the making of software. I would say Rust gets the brunt of the hate because it's new, but in 2026 that's not really true anymore.