- No making fun of people for their voice/accent.
In case they remedy the point above with forced localised servers, this would be rampant.
Fuck, if a frenchman hears a Belgian or Swiss accent, he immediatly goes into "superiority complex mode" and becomes unbearable.
Same for any language (to a lesser degree, of course: no one is as full of himself as a frenchman*), large groups will always mock a small group's accent.
Unusual voice? You're fucked.
*Hence why I usually play on UK server when I have a choice of EU servers, not french-speaking ones.