From my experience, "most" of those JavaScript developers who "hate JavaScript" are in fact front-end developers who hate writing JavaScript for websites, since they struggle daily with issues such as cross-browser compatibility and inconsistent DOM implementations, which have nothing to do with JavaScript at all, and can't be fixed by a different syntax.

It's also compounded because the majority of front-end developers write their code procedurally for each application component, which creates a terrible nest of repetitive and error-prone code.

They feel the pain, don't know how to solve it, so switch to a different syntax, blaming that as the root cause of the problem.

But feeling enough pain to viscerally HATE a language, as many front-end developers do, is not something that can simply come from the syntax of the language and the fact that the equality operator does type conversion and whatever small list of gripes users have. Most other languages (including CoffeeScript!) have a similarly-sized set of flaws and aren't nearly as derided.