So in a way you are bringing up attribution theory; does our behavior reflect upon yourself, an external factor, or was it a product of the specific circumstances in which we behaved in. To determine that the preference is of one's own behavior we would need consistency, consensus and distinction.
For example, let's say Bob is adamant that he is a fan of the Final Fantasy series and recommends it to you. If he reacts poorly to a different series we can say that his behavior is distinct. If he reacts the same way at a later date under different circumstances than it is consistent. Finally, if the reviews are bad, then we can conclude that his behavior in liking Final Fantasy is wholly attributable to Bob himself.
But what if he reacts differently after reading a poor review? What if, at a later date, Final Fantasy is not brought up at all when you talk about video games? What if he consistently says he loves every video game you suggest? Than his behavior is attributable to an external factor.
Finally, it very well may be possible that he played the game with someone whom he admired in the room, and thus he attributed his good mood to the video game, which is also possible. Or maybe he saw someone he admired praising the game and decided he liked it too.
So many variables!
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