Really? Well, that's wrong. And due to western / zionist apologists at that.
As a matter of fact, a leading refomist pseudo-intellectual like Tehran University professor Sadeq Zibakalam, who's best known for clownishly avoiding to step on zionist regime flags painted on the ground of the campus, and who tried to publish a book on the conflict in Palestine in which he basically rehashes zionist narratives, famously declared that it makes him happy when the Iranian national football team loses a match, because he, as a prototypical liberal globalist, is having issues with Iranian national sentiment, which he equates to "racism" (while zionist supremacism and apartheid, seem not to be much of a problem for the subject).
Indeed, Iranian apologists of the US and zionist regimes hateir the national football team. Which, incidentally, offers an insight into the astonishing levels of freedom of speech which prevail in the Islamic Republic of Iran (which many consider as too lenient, in fact).
Yet another self-defeating contradiction in the zionist propaganda campaign against Iran. Trying to spread anti-national mindset through their fifth columnists (who will claim that patriotism is racism), and simultaneously seeking to attack the Islamic Republic in the name of Iranian national pride (for its football team). Some pathetic cognitive dissonance that it, as usual.
"Throw everything at'em, something's gonna stick" no longer works, Iranians are waking up to the reality of the NATO-zionist existential enmity against the Iranian nation.
Hahaha, football hooligans have traditionally served as instruments for NATO and the zionist regime to help ignite conflicts and large scale war crimes, subvert, destabilize and destroy nations. Former Yugoslavia and so many other examples are there to illustrate it.
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Yes, we need to keep intact and promote moral decency in the public sphere. However, in this specific case, the regulation has rather been motivated by the fact that men at football stadiums often use extremely foul language (including sexual and family insults) when singing in support of their team (or against the opposing team). Those Iranians who shed tears about this ought to learn civility and manners first.