When one makes disparaging remarks about a brand he/she bought and which performed inadequately, the negatively-slanted commentary is likely due to all of the following EXCEPT:
Selective perception, based on inadequate time to process all aspects of relevant information (e.g., things "happened fast" at the time of the product failure)
His/her attitudinal biases, brought about through needs, mood, values and experiences
The Success-Failure Bias
Memory biases, in combination with ego-defense
All of the above