Anti-discrimination charity Kick It Out says "sexism isn't banter" after derogatory chants about Phil Foden's mother were sung during Sunday's Manchester derby at Old Trafford.
The Football Association, according to its rulebook, will not take action against Manchester United over the chants, which could be heard throughout the first half of the goalless draw and when Manchester City forward Foden was substituted in the 57th minute.
Following the match, City boss Guardiola said those joining in with thechants showed "a lack of class" and "should be ashamed".
Kick It Out chief operating officer Hollie Varney told BBC Sport: "We've seen several incidents of sexist and misogynistic mass chanting in men's football this season, yet too often the response from football falls short.
"Sexism isn't 'banter'. Hearing sexist chants echo around a stadium doesn't just affect the players involved or those directly targeted, it creates an environment where women can feel unsafe or unwelcome."
What do the FA rules say?
Football Association rules do prohibit abusive chanting and discriminatory behaviour from fans.
FA rule E20 states clubs are responsible for ensuring their supporters "refrain from improper conduct", which includes "a reference, whether express or implied to any one or more of the following: ethnic origin, colour, race, nationality, religion or belief, gender, gender reassignment, sexual orientation or disability".
The FA says it investigates all allegations of discriminatory conduct by spectators. Its rules also state a club is "likely" to face disciplinary actions if there is "sufficient evidence of mass discriminatory chanting".
In recent years the FA has cracked down on tragedy chanting and racist and homophobic chanting.
Clubs have been fined, and some fans have been given banning orders and have faced criminal charges.
In 2023 the Crown Prosecution Service (CPS) updated its guidance on football-related offences, confirming that tragedy chanting can be prosecuted as a public order offence.
The guidance also includes reference to other hate crimes, such as homophobic or racist chanting or gestures, and pitch incursion.
So why won't the FA act here?
The FA does not currently take action on all offensive chants. It did not charge Millwall after some fans chanted "let him die" at Crystal Palace forward Jean-Philippe Mateta when he was treated for a head injury on the pitch during a fifth-round FA Cup match last month.
The FA condemned those chants but said they did not breach its regulations.
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