with the circumstances that both teams state that don't like each other. Someone on the 49ers said that he doesn't know anyone here that likes the Seahawks and if you find one let him know. Sherman joked that there probably won't be handshakes after the game.
I think this article is very detailed
http://espn.go.com/nfl/playoffs/2013/story/_/id/10321064/2013-nfl-playoffs-richard-sherman-takes-shots-michael-crabtree
Crabtree apparently called him out prior, there's a lot of head games and trash talk that goes on, Sherman just didn't censor it for the media which I don't have a problem with. I like this line he says a lot right here
"He said something personal face-to-face," Sherman said. "He knows what he said, and he knows I'm going to be tough on him the rest of his career."
on edit-
He is confident in his abilities so much so that he can't believe they even target him with receivers that aren't top level or #1. I can't imagine he'd say the same thing if it was Boldin. He seems to more honest than most other athletes when speaking to the media.
Here is more of Sherman's style and in one case, Trent Williams didn't appreciate it. --