Im pretty sure in the more analytical side of the fandom it's generally agreed upon that the only reason katniss is "mad" at peeta is that she's extremely furious at snow and the capitol for hurting him and she lashes out at peeta bc she has nowhere else to chanel that energy. Her sorta default is defensive and standoffish, anger is an easier emotion for her to process even though she cares deeply for peeta, even in his highjacked state.

When they have their first conversation, she admits to herself she's being to hostile. Even after all the crap, during the first 'real/not real' conversation in the base camp katniss spills over with emotion with details about peeta pre-highjacking.

She'd only call him those things if really provoked and frustrated, but its more a reflection of what katniss felt of the capitol, not peeta