Originally, the YADTT rating was created as a way to badge those posts where it appears a poster takes something SO out of context that the person giving the rating believes that misinterpretation to have been deliberate. It was intended as a way to call someone out for exhibiting behavior most commonly associated with (and commonly perpetrated by) one particular forumite (whom I shall not name).
However, through common usage, the YADTT rating has also gained an
alternate definition, one where it is given to call out a forumite for exhibiting behavior most commonly associated with
that specific forumite, such as when
@GasBandit espouses Libertarian ideology,
@DarkAudit rails against Big Coal, or when
@Dave declares his distaste for
deep-fried distal digits.
When encountering the YADTT rating "in the wild,"
both options should be considered before lighting the bonfires of indignation.
Also, if you can think of a better/more appropriate icon than the Do Not Enter sign, PLEASE suggest it, because I'm right there with you that it doesn't really fit, but everything I've come up with so far looks awful once shrunk down to rating badge size.
--Patrick