Things that make you doubt people's credibility

[Gustaf]

Hm, lots of stuff.

People who repeat talking points as if they believe them.

People who lecture about stuff based on this fantastic book they just read (regardless of subject).

People who talk with big eyes about foreign cultures or countries.

People who don't get economics, yet still talk about it as if anyone should listen.

People who say they can't stand movies that are black and white or slow or can't read books that "make them sad"

Hm, I'm quite the misanthrope. Which reminds me:

People who are cynical.

[Gustaf]

People who say they can't standing movies that are black and white or slow or can't read books that "make them sad"

Oh God yes.  Add "I hate subtitles."  Though I usually even watch movies in English with the closed captioning on because I'm a visual person and it's easier for me to follow if I'm reading the dialogue than listening to it.

Right. Being a Swede I don't encounter that though.

And I agree on liking subtitles in general. It really helps to follow the dialogue in a lot of cases.