The video in question appears to be a Latino pissed off about the "English only" decision. I'm saying it's tone deaf to ignore that there would be some people there who would find that decision reprehensible, in particular, after a bunch of Sanders supporters cheered it.
There are literally people in this very thread laughing because the OP wrongly assumed it was someone else saying that, when it was obviously a Clinton supporting Latino annoyed by the decision. No one is paying attention to these finer details.
As far as rules for translators, the whole thing is ad hoc nonsense, the moderator played his part, announced anyone could come translate if they wanted to (being that the room was half bilingual and could easily catch a translator being nefarious), but shot it down when no consensus could be had. It became apparent that after his "English only" decision a good several dozen Sanders supporters cheered for it.