Don't worry, it sounds like you're an absolute nightmare to work with, so I doubt any of the candidates that didn't pass your filter are missing out on anything. Win win!
Not spelling it JAVA or GIT is a minor, but important detail in an industry full of acronyms. People who miss out on small details like this are also make massive mistakes elsewhere in their work and tank the productivity and morale of their teams as a result.
But at the end of the day, software startups want hackers. And hackers know how to spell Java.
Spelling it JAVA means you are ignoring that it could stand for an acronym. I don't see how that's biased against non-native English speakers; languages other than English have acronyms. I suppose it could perhaps against speakers of languages that don't have the concept of uppercase/lowercase; but then wouldn't you expect speakers of these languages to reproduce the (unfamiliar) name "Java" exactly?
Given that this is a forum and low stakes, I just find it rather amusing.