CoffeeScript compiles to Javascript. Batman.js can most certainly be a Javascript framework and give examples in CoffeeScript. Many people prefer CoffeeScript for a variety of reasons, including readability.
Also, you aren't entitled to dictate instructions to other people who are giving you the benefit of their hard work. It's rude and obnoxious.
Maybe the guy you're replying to edited his post, but "If it's a JavaScript framework, please give code examples in JavaScript"--to me--reads as a rather polite request, rather than a dictum as you suggested.
Except for at the top of the example you pasted, and at the top of the documentation page, under "Introduction" in big letters, whe it says "batman.js is a framework for building rich single-page browser applications. It is written in CoffeeScript and its API is developed with CoffeeScript in mind, but of course you can use plain old JavaScript too."
Also, you aren't entitled to dictate instructions to other people who are giving you the benefit of their hard work. It's rude and obnoxious.