Chelsea boss Jose Mourinho refused to discuss Real Madrid's thrashing by Barcelona on Monday.
The former Real coach was asked for his thoughts on the disastrous result.
"If I speak about Real Madrid, I speak when they are winning. Not when they are losing. So, from me, words about the Clasico? Zero.
"I see so many people speaking, especially about the clubs in trouble. It's amazing the lack of respect and ethics.
"I don't enjoy other people losing matches. I enjoy my club winning matches. I don't smile with defeats for other teams. I smile with my victories. That's why I've not smiled a lot in the last four or five months."