A penalty was granted by referee Jose Gonzalez, after Marcelo was brought down by Athletic midfielder Dani Garcia in the subsequent half.
Gonzalez took the choice in the wake of counseling the pitch side VAR screen.
The outcome put Madrid four away from rivals Barcelona.
“We aren’t going to win or lose the league thanks to referees,” Ramos told Movistar.
“Whoever has made mistakes and hasn’t achieved their objectives should be critical of themselves. It isn’t down to referees that Real Madrid are first.”