How, dalitis? What does a Clasico final have to do with Mourinho, lol.
Well, Dr. Pepper. Mourinho has been a serial failure in recent seasons in the CL which is in complete contradistinction to the propaganda unleashed on us football fans after the unfortunate series of events in 2010. He failed to reach a single CL final with either Real Madrid or Chelsea (let alone win the CL, which was allegedly his speciality)
If Carletto now manages to steer Real Madrid to another CL final, then the embarrassment for the Mourinho brigade will get even greater. Mourinho is also a vehement hater of our great club and is disgusted every time we win. Seeing a Clasico final, will annoy him, and his fanbois no end. It just doesn't fit their narrative.
Edit: Just listen to what every Chelsea fan (the most obscene kind of Mourinho-fanboism) has to say about our team and our titles. They keep saying that we got lucky with our titles, that the refs had our back all the time, that we had easy draws, that European football was weak at the time etc etc etc) I follow closely what they have to say, and a Clasico final would frustrate them without limit. Bring it on, my vindictive part says! Just don't have CR score any goals, even penaldos or tap-ins.