Huh, apparently I'm racist against all Brazilians because I dislike this one specific dude who keeps filing invalid bug reports on MAME and insists on trying to revise the English documentation despite his English being not great. News to me.
Everything. Today he filed a report saying that MAME crashes when using -profile, because he thought the profiler output was a callstack. When I replied that if he continues filing invalid reports his access will be curtailed, he sarcastically & angrily blamed the documentation.