That's according to Sport English, which reported a number of Madridistas waited by the exit to the Bernabeu to insult the players.
The defeat is Real's third consecutive derby loss at home and has put their La Liga title challenge in serious jeopardy as they are now nine points behind Barcelona, who have a game in hand.
Per football journalist Dermot Corrigan, president Florentino Perez did not escape the flak either:
Also chants of 'Florentino resign' outside Bernabeu with angry group gathered near where the VIPs leave.— Dermot Corrigan (@dermotmcorrigan) February 27, 2016
Indeed, as Sport's report noted, the incident required the presence of "heavy security around, who had to intervene to stop some fan discontent to prevent anything untoward happening."
Football journalist Sid Lowe was puzzled by use of "mercenary" as an accusation toward the players:
Mercenary as the worst criticism always struck me as an odd one: isn't there a case for saying mercenaries are the ultimate professionals?— Sid Lowe (@sidlowe) February 27, 2016
Sure, loyalty, romance etc, of course, but I mean the concept: mercenaries literally risk their lives for their employers.— Sid Lowe (@sidlowe) February 27, 2016
Los Blancos manager Zinedine Zidane admitted his side's title hopes had taken a serious blow after the game, per Corrigan:
Zidane: "La Liga is not over, but it was difficult before the game. Now even more. But we will continue, will not throw in this season."— Dermot Corrigan (@dermotmcorrigan) February 27, 2016
Sport compared the defeat to the sinking of the titanic:
Atletico are the first visitors to win three consecutive La Liga games at the Bernabeu—a feat not even Barcelona have achieved.
The accusation at Benzema seems somewhat unfair given he went off injured at half-time, but Ronaldo in particular has struggled against their rivals in recent times—and indeed the league's top sides—as Corrigan and Sky Sports Statto revealed:
BTW Ronaldo just two goals in the 10 derbis since the 2014 Champs League final - none in last five meetings.— Dermot Corrigan (@dermotmcorrigan) February 27, 2016
.@Cristiano Ronaldo in 2015-16 La Liga— Sky Sports Statto (@SkySportsStatto) February 27, 2016
Record v teams currently in top 5 - 0 goals (5 apps)
Record v rest of the teams - 22 goals (21 apps)
The 31-year-old was guilty of missing a gilt-edged chance to take the lead in the game when he found time and space in the area just 12 yards out.
Ronaldo generated controversy after the match as he appeared criticise his team-mates. Per Sport, he said:
If everyone was at my level, we would be first...
If a team doesn't play with its best players, it's difficult to win. I like to play with Benzema, [Gareth] Bale and Marcelo, it's tough when they're not on the pitch. I don't want to say that Jese [Rodriguez], Lucas [Vazquez], [Mateo] Kovacic are not good, they are good, but...
Are the accusations fair?
Though the forward has scored 34 goals in 33 games this season, he has often fallen well short of his own standards of performance with a number of anonymous performances.
In his defence, that could be down to plenty of factors including his age and the entire team's struggles in some games under Rafa Benitez and now Zidane, rather than simply a lack of effort.
Ronaldo and his team-mates will need to seriously improve to salvage what's left of the campaign.