"Did you think I was mad at you?"
She DEFINITELY was. She was--it's just that the truth saved Kuroya's bacon by soothing the Kasumi MC-kun publicly snubbed twice. When she got up, warning him that she'd get angry "for real" that time, she seemed to have already been warmed up to reach that level of heat.
That said, MC-kun is exhibiting traits common to some of the worst of his sort: a self-centered paranoia imbued thoroughly with timidity. He doesn't quite say it, but his thoughts quickly go to how he's unwittingly stepping on others' toes (since he clearly doesn't know how he upsets Kasumi), what (he thinks) other people are doing to him, or simply what's happening to him. At least--once again through Kasumi's pressure--he made up, somewhat, for his rather unaffectionate and cowardly conduct toward his girlfriend; maybe things will turn around from here.