Meanwhile FIFA's head of sustainability and diversity, Federico Addiechi, defended differing sanctions, such as 70,000 Swiss francs (70,000 dollars) for Croatia not using official drinks during a match and 10,000 francs for Mexico due to their fans' homophobic chanting.
"FIFA will take action against things that are wrong - we've done it with individual broadcasters".
Anti-discrimination group Fare Network says sexism has been the biggest problem of the World Cup.
Powar said with Russian authorities also keeping home-grown hooligans away from games, the World Cup had an worldwide crowd "very different to the fans that come to domestic football".
The Argentine referee will blow the final whistle at Luzhniki Stadium on a tournament he began there by handling the opening game, when Russian Federation beat Saudi Arabia 5-0.More news: Trump tweets out letter he got from Kim Jong Un
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This is one of the activities that we definitely will have in the future - it's a normal evolution.
Instead, soccer's treatment of female media workers and fans provoked debate.
Federico Addiechi said football's world governing body needed to help tackle sexism at the World Cup.
Though Mr Powar added that the real number of incidents is likely 10 times higher.
"We hope that this World Cup will have a long-term impact on Russian society". All were young women.
After Horacio Elizondo in 2006, he becomes the second Argentinian referee to officiate a World Cup Final.