Real won 1-0 after Sergio Ramos converted a penalty won by Marcelo - via VAR.
Muniain snapped: “I would tell you that we deserved a little more, at least a draw. It is true that the penalty was not replayed, seeing it live gave me the feeling that it was not.
"A few minutes later Raúl García received a stomp (from Ramos) and they have not even reviewed it. We already know the tone of these last days and in favor of which team these decisions are chosen. Let everyone draw their conclusions."
Raul Garcia appeared to be fouled in the Real area by Ramos immediately after the spotkick was struck.
Muniain added: "Raúl has told us that he has been stepped on. The difference is that theirs has been reviewed and ours was not."