This whole line appears as an after effect of a "Be Perfect Driver" where it strives to make Sarah less perfect than Emily's friend opined.

As children we are said to begin in the I'm o.k. - you're o.k. position. The current senario shows movement away from that position of innocence. In the current position (I'm o.k. - you're not o.k.) taken by Emily, feelings of superiority are thought to be motivating factors in the psychoanalytic school of thought:

" This position is a trap into which many managers, parents and others in authority fall, assuming that their given position makes them better and, by implication, others are not OK.

These people may also have a strong 'Be Perfect' driver, and their personal strivings makes others seem less perfect."

Sarah seems less perfeect.