I don't think doubts about the fanbase can actually put dents into Cena's armor.
We've established for 6 years now that Cena hears the haters and that they don't bother him. This is not a new phenomenon that Rocky is exploiting here. He's stared down Canadian crowds when up against Jericho, Hammerstein crowds when facing RVD, smark crowds in general while fighting Triple H and HBK, and now he faces a Chicago crowd soaking in that CM Punk kool-aid. None of this has ever even begun to bother him. Nothing Rock can say about it should either.
There are ways to change Cena's character, but we're long past the "fans have turned on him and he feels slighted by that" opportunity.
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Thank you, Eddie Guerrero.
http://cdn.buzznet.com/assets/imgx/1/5/2/7/4/5/7/1/orig-15274571.jpg