DR TCB: Yes, Paula was referencing Simon and said he couldn't stand one of the contestants. This was at a time when they were paring down hopefuls after they'd performed in a group.
To the best of my recollection:
Randy and Paula had liked a contestant, Paula thought, and Simon hated him. Paula accused Randy of changing his vote from yes to no based on Simon's detestation of a contestant and she was arguing with him when Simon told her not to talk behind his back. That inference made Paula furious.
She later explained what was going on, but it was an ugly moment. Randy, however, despite whatever he might have told Paula, would not change his vote and the contestant was excused.