Guidance for on-the-water shouting

This situation has either happened to you, or will. Doug McKnight, a US Regional Judge and Club Race Officer, posted this question on the Racing Rules of Sailing Forum which offers an opportunity for experts to share their wisdom:

Is there anywhere to find guidance on what level of on-the-water shouting becomes unacceptably bad manners, or unsporting?

The scenario has a competitor on Starboard, who wants to tack on to Port (due to hitting the layline, in his opinion), but is pinned by a boat about a boat length to windward and a little behind who doesn’t want to tack. The wind was strong.

Instead of maneuvering in one of the obvious (but annoying) ways to create room to tack, the leeward boat starts yelling “tack!” “we have to tack!” “tack!” in a way that could perhaps (?) be considered rude/intimidating/bullying/obnoxious. He did not shout “room to tack”, which may be a different matter.

If Windward was an experienced sailor they would just ignore him, or tell him to shut up. A less experienced sailor might think they have to tack due to an experienced racer yelling at them like this. It reminds me a little of case 47 (hailing Starboard, while on port) though obviously not as serious.

Any pointers to relevant cases, examples, etc, would be much appreciated. Could this rise to being a rule 69 violation? Click here for the responses.