In Act II of the play, The Merry Wives of Windsor, how does Mistress Ford mock Falstaff?

In Act II, after receiving a letter from Falstaff, Mistress Ford mocks Falstaff's status as a knight, his fatness, and his writing style. Her response makes clear that he is an outsider at Windsor: "What tempest, I trow, threw this whale ... ashore at Windsor?" (II.i.64-5).