Murray loves crowds that get on his case. He tries to troll them like a good heel.
True, though I dont think they were really on his case today, the atmosphere today was different to the one against Gasquet in the FO for example. In both matches, UE's from Andy were cheered but I don't think the crowd today were meaning to be disrespectful. They just badly wanted to see a third set and got a bit over-excited, whereas against gasquet the crowd were pretty mad at him and wanted to show it.