In English, one-word responses often denote sarcasm. A common example you might seeing in movies and television is: if one says a lame joke and another replies in an unenthusiastic tone of voice, “Hilarious,” it implies that the person thinks that the joke was not funny at all.

Dans the case of your example, the lady was probably commenting on how unsubtle the man’s advertisements of Esurance was (modern commercials often enjoy poking fun at themselves in that meta way).