Comment by willy_k

Threatening is not the same as an actual threat. If someone stood up on a plane and yelled “bomb”, the default implication is that there is a bomb present.

If someone gets up and yells “F the captain”, it is reasonable to be fearful that they might act on that sentiment, but the statement itself is not a threat; not an expression of intention (or in the former case, presence of an object that is intended) to inflict evil, injury, or damage.