i believe that all of indonesians know english quite well since every school in indonesia since kindergarten until high school (even college) has english class.
They're just ignorant. They don't give a f*ck about others.
It's their culture, it flows on their blood. You can only put up with it or ignore it.
source : i'm indonesian
May i offer a solution?
3 days ban for every accounts that's caught talking in indonesian