Carlo Ancelotti’s men lost the first Clasico of the season, with Neymar and Alexis Sanchez scoring in either half.
Jese Rodriguez scored a 90th-minute consolation goal in vain.
The win earned Barcelona a six-point cushion over Madrid, as they continue to set the pace in La Liga early on.
However, Los Blancos’ players claimed Javier Mascherano’s challenge on Cristiano Ronaldo in the second half was a clear penalty, and were full of criticisism for referee Alberto Undiano after the game.
However, Busquets has hit back, saying Madrid must stop “crying” and move on.
“Madrid crying about the referee? They always look for excuses. They have no reason to complain, not today, not earlier this season,” Busquets says.
“The easy excuse is the referee. Same as always. They cannot complain at all this season about the officials. But if they will, they will.”
Barcelona’s second strike was a sublime chip by Sanchez in the 78th minute, and Busquets was full of praise for the Chilean international.
“It was a wonderful goal by Alexis, it was beautifully crafted,” he says.