In Bob´s argument we can infer an inductive fallacy known as fallacy by association which it is affirmed that the qualities of a specific object correspond to those of a general group, through an inconsequential relationship. It is argued that one´s qualities are intrinsically or essentially qualities of another simply by association.
On this case, we can evidence a fallacy of anecdotal evidence, hurried generalization or law of small numbers which consists of establishing a generalized conclusion based on isolated or anecdotal facts.