Well, assuming that he said dumb and was angry, then we don't know what he's referring to as dumb. Bevell's playcalling? Wilson's play? Tate's routerunning? Did Wilson audible that screen? The play itself was horrible and Pete walks right past Bevell before saying it, so in all likelihood he was talking about the play call. But that doesn't mean he was. If more cracks begin to show between Pete and Bevell then we'll have a good indication that Pete's fed up with Bevell's playcalling. Until then, it's all conjecture at this point.
Richard Sherman doesn't just wanna get in your head, he wants to build a vacation home there.
R. Sherman: "I don't want to be an island. I want to be a tourist attraction. You come, I take your money & you go."