The description states that this is an Idiot Ball trope. The thing is there are many non contrived reasons for a character to be a bad judge of character.
Also the trope does not seem to center around the character doing the judging as much as the one being judged. It seems to be "characters get dumb around this person" as opposed to "character is dumb"
Before I attempt a TRS of Horrible Judge of Character I want to informally discuss it here.
The description states that this is an Idiot Ball trope. The thing is there are many non contrived reasons for a character to be a bad judge of character.
Also the trope does not seem to center around the character doing the judging as much as the one being judged. It seems to be "characters get dumb around this person" as opposed to "character is dumb"