What did Kat is do to him as a result of what Peeta reveals in his interview?

From the text:

Peeta has only just stepped from his car when I slam my palms into his chest. He loses his balance and crashes into an ugly urn filled with fake flowers. The urn tips and shatters into hundreds of tiny pieces. Peeta lands in the shards, and blood immediately flows from his hands.
“What was that for?” he says, aghast.
“You had no right! No right to go saying those things about me!” I shout at him.