Answer:
Harold's reaction reflects the "fallacy of positive instances".
Step-by-step explanation:
The "fallacy of positive instances" states that people tend to accept positive information or ideas that they already agree with (or positive remarks about themselves). They however ignore or reject negative comments or ideas that contradict what they want to believe about themselves or a particular situation.
Harold, by accepting the positive remarks as accurate and rejecting negative ones, is exhibiting the fallacy of positive instances.