Which characteristics of abstract expressionism did pop artists rebel against

Pop Art is a style of art which explores the everyday imagery that is so much a part of contemporary consumer culture. Common sources of imagery include advertisements, consumer product packaging, celebrity photographs, and comic strips.

That means subjects. Abstract paintings by definition have no subjects.

It isn't so much a rebellion against Abstract Expressionism ; it's just to take art in a new direction in order to be noticed.

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satin. 

"very shiny satin may look great in the fabric store or in the sewing room, but once onstage it can look fake and cheap as it reflects the light from the fixtures."