It is not a big deal for Real Madrid to lose El Classico, what is important is that they become champions at the end of the year. I am sure that many Real Madrid fans would prefer to become champions. Yes, they suffered a heavy defeat against Barcelona, but there is a possibility that they can be the leader of the league right now. Barcelona is playing a very interesting game. There is no trace left of Barcelona, which played magnificently at the beginning of the year. There is no explanation for their defeat to Las Palmas in their own field. They are probably trying not to become champions this year.
Yes it may not look like a big deal but six points is enough to deny them the trophy actually so you cannot undermine the winning of at least one of the el classico games, if Barcelona keeps winning and literally wins all of the el classico it's a plus for them and may like get them the advantage so Madrid actually does need that win even if it's one of the two wins.