A first-half goal from Neymar and a chip from Alexis Sanchez 12 minutes from the end sealed all three points for Blaugrana, but the 27-year-old believes that the referee had a bad game at the Camp Nou.
"There are things against which we cannot fight," Football Espana quotes Ramos as saying. "Two clear penalties and a handball.
"In these sort of games you can't even talk to the ref."
The result leaves Los Blancos six points off the pace in third.