If Real Madrid can beat many big clubs in Champions League even when they were conceded first in the past season and in this season, it's not big matter for them to beat Barcelona at Camp Nou. If they play with their best, they can beat Barcelona there.
Barcelona are weaker than many big clubs in Champions League that is shown in their failed group stage and they were relegated to Europa League at which they failed in two play-off matches with Manchester United.
Anyway, the first El Classico in Coppa del Rey is very funny. From some personal clashes on field especially the moment between Vini and De Jong. Then a moment how Barcelona got the only and winning goal in the match.
Even with a bad form, Barcelona was able to beat Real Madrid at the Santiago Bernabeu. I think it's bullshit actually, because what? Of course, because people keep thinking that Real Madrid is the strongest team without admitting their weakness against Barcelona this season.
Stop the bullshit, in La Liga there is no stronger team than Barcelona this season. In the Spanish Super Copa, Barcelona is the champion this season, and regarding El Clasico Barcelona has won the last 4/6 matches over Real Madrid. So never underestimate Barcelona, you can say they are weak only if you don't know football.