I wonder if this comment was to help himself feel better or an excuse as to why Rachel's ratings have gone up.
Keith has no shame. So I would guess that he's trying to make himself feel better. If she continues to knock him down in the ratings he won't be applauding her that loudly. Eventually everybody will tune him out and turn him off. Mostly because they'll get tired of his whining and bashing and fighting with co-workers.
He just can't hold a candle to her where personality and attitude are concerned. She's nice and he's just plain mean.
However, he might want to be paying more attention to his little girl rather than being so concerned about his ratings.