it happens everywhere. just a common thing in wrestling, mostly in Greco-Roman because the criteria for passivity cautions isn't that clear so they think they can make the referee's mind by shouting Red/Blue passive for the entire 6 minutes. it's not like they really believe they deserve a caution or not. they start shouting "passive" after probably 20-30 seconds into the match.
in Asia, they usually use bigger stadiums, so you usually only hear two coaches around the mat shouting that, but from what I see in Europe, most of the time the other team members are right behind the judge and you hear something like 20-30 persons even make a song with that "Red pa-ssive, red pa-ssive, red pa-ssive " damn I would want to punch all of them
as you know each wrestler can have two coaches near the mat, one of the sitting right next to the mat and the other one 2-3 meters far from the mat. for Iranian coaches, usually one of them gives technical advice (again, non-stop for the entire 6 minutes) and the other one's responsibility is to just shout red/blue passive ! it's always fun for me to watch those matches in livestream where you can hear the coaches, most of them Iranian coaches say funny things but sometimes that "passive passive" chant make it impossible to hear what they are saying. another reason why I hate it