[atq2119]

FWIW, calling somebody a piece of shit goes against personal insult laws in many countries, so in your particular example, the neighbor may in fact be obligated to take down the billboard, or at least to modify it.

Obviously depends on the jurisdiction.

[melq]

FWIW there are few expressions of free speech that aren't in violation of some arbitrary law enforced by some arbitrary country. It was probably short-sighted of me to assume that my exaggerated example wouldn't be recognized as hyperbole, but honestly what is the point of this comment?

Everything depends on jurisdiction, that's the very nature of law in and of itself.