A lot of Real Madrid fans were unhappy when they saw defender Marcelo wishing happy birthday to Neymar but not to Cristiano Ronaldo.
The attackers share a birthday, but when Marcelo sent a message to his Brazil team-mate rather than his Real Madrid ones, fans were very unhappy.
Neymar lines out for Real's bitter rivals Barcelona, and supporters did not appreciate what they saw as the full-back snubbing their idol.
The Brazilian posted a photo of himself with Neymar, with the caption "Congratulations and many happy returns. Lots of health, love and success little bro I love you!!"
However, Marcelo was inundated with replies asking him why he didn't celebrate Ronaldo's birthday, causing him to snap at his followers, writing "Shut the f**k up idots."
The 28-year-old later shared another Instagram photo of himself with the Portugal attacker; but by then the damage was done for a lot of Madrid fans!