I guess what bugs me is that the INT and Sherman's play was not an indication that Crabtree is a mediocre WR. It's more of an indication that Kaepernick is a mediocre QB and it was a bad decision and a bad pass from a mediocre QB and sure, also that Sherman is indeed one of the best, if not the best corner in the league.
Sherman used the moment to settle a personal beef with Crabtree - he looked like a doosh doing it. He's a smart enough that he shouldn't be surprised that people think he is one now. i'm not sure he gets the same reaction if he went after Kaepernick instead of Crabtree.
It doesn't mean he is a doosh - just because he was acting like one but most people don't care - they're happy enough to label someone a doosh, or worse, based on his 10 seconds of dooshbaggery.