It's Indonesian, not a 3rd world language, but one of the most spoken language in the world, spoken by almost 200 million people. I think, since it is a quite new account, he didn't read the forum rules so well.
No need to be so aggressive towards him/her.
That's all irrelevant. The main forum here is in English. I wouldn't dream of going
to a French language forum and expect them to tolerate my posts in English. That's almost
common sense, but that seems to be lacking here.
It doesn't matter if a person only speaks English. You're expected to post in that language
here. Not being able to write it correctly makes it harder for people who speak it well to
understand, and it's very frustrating. If your command of English is limited, your range of
expression is limited, and if you can't express things well, your posts are going to be
garbage. That's the logic here.