Paul Scholes was NOT happy with the flags attendees were given at Old Trafford just a day after Manchester City completed a treble.
Man City beat Inter Milan 1-0 in Istanbul to win the Champions League, having also won the Premier League and FA Cup this season.
Fans online jokingly claimed Man United paid tribute to their cross-town rivals following the flag situation at Soccer Aid.
Blue and white flags were waved around Man United's stadium prior to kick-off for the UNICEF charity match.
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Red Devils legend Scholes hit out at the decision to give Man City-coloured flags to supporters as he posted a furious message on Instagram.
"Somebody has to be taking the p**s with all these flags," he wrote, accompanied with a picture of the blue and white flags at Old Trafford.
The flags also sent social media wild as Man City fans couldn't believe it.
One Twitter user wrote: "Some has dropped a boll**k here. MAN CITY HAVE WON THE TREBLE."
A second joked: "Nice tribute to the neighbours. Proper respect."
A third added: "Oh the irony….and the day after City win the treble."
A fourth said: "Looks like Man City have taken over old Trafford.2
Another commented: "No way they done that !!! Why did United let that happen."
Man City became the first English club to scoop the Premier League, FA Cup and Champions League in a single season since Man United's achievement in 1999.
Topics: Paul Scholes, Fan Reactions, Manchester City, Manchester United, Football
Nasir Jabbar