Sherman later explained the sequence that led to Williams' face push.
"He came up and tapped me, 'What's up now? I'll swing on you,' " Sherman told USA Today Sports.
Sherman showed no fear of the 6-foot-5, 325-pound lineman. He said he told Williams to "Swing!" in a daring tone.
"He told me was going to swing, and he swung," Sherman said. "That's what he did, and that's that. He thought I was going to be scared. I'm not scared."
Williams later issued an apology for the incident.
Sherman said he was just trying to shake Williams' hand after the game, but the postgame taunting is an example of just how skilled the cornerback has become at burrowing underneath an adversary's skin.
Follow Kevin Patra on Twitter @kpatra.