@Wolvenworks
Could be they are of the kind that can't be at ease unless they see/listen/read atleast a bit of stuff they don't like and then say something bad about it.
Might even say they love to hate on stuff, and can't focus on what they need to do unless they get to hate on stuff occassionally.
(A woman I know says it's therapeutic for her, can tell she's far friendlier and easier to be with in general since she started with that sort of habit on the side.)
Then, they might not be such people and having no reason whatsoever.