Those of a negative bias will always generalize their experience, especially if they are, in fact, burnt out on something.
They claim to be looking for reasons to differentiate one thing from another, but in truth they're subconsciously looking for reasons to homogenize it. One who fears disappointment will always find it, as will one who expect it.
It's a common behavioral addiction - one I struggle against as well.
People tend to forget that engagement is a two way relationship.