Yeah the same fans that sung f..k off Mourinho when we played youse at the bridge constantly, it wasn't one or two was it. It was most of your stadium. Your most successful manager always got a hard go by you lot. A member of the Chelsea background staff taunted him when Barkley equalized. Chelsea fans are deserve criticism, it's not only booing managers that Chelsea is associated with.
I believe you reap what you sow, and when Mourinho chose to go to war with Conte (behaving like a child in doing so) he took on the fans as well. He doesn't care, so why would we?
The (currently fashionable) opinion that Chelsea FC and the fans alike should forever be in his debt for the trophies we won together is bizarre. We are no more in his debt that he is in ours (we gave him the perfect platform to build and show the world his Porto success wasn't an AVB esque one off).
The ironic thing is that the Chelsea fans who are now being branded as "classless" stuck by Mourinho when everyone, and I do mean everyone, had turned on him. We were singing his name when we were 16th in the league and looking in a worse state than we had been in for 20 years. Rival fans were loving his demise, the media were loving his demise, and Jose was picking fights with everyone inside the club that you could think of, and had of course lost the dressing room..... but Chelsea fans stuck with him to the bitter end. We had his back and showed blind loyalty.
Can you imagine if Mourinho has United in 16th place; do you think the supporters would be singing his name? A fair portion wanted him sacked when he had you 2nd.
In a nutshell respect is, and always will be, a two way street. Juan Mata is applauded by the "classless" Chelsea fans every time he returns, and again when he's subbed off or on. Zola was given a hero's welcome every time he returned as West Ham Manager, Lampard was applauded when scored to cost us 2 precious points, Cech gets applauded. So there are four examples of former players and Managers, who have joined rivals, and still been given a hero's welcome on their return.