An aside, like sotto voce, but spoken loudly enough that the person who is the subject can hear it.
Note: There is no synonym that I'm aware of.
When he said "someone doesn't know their place!", he didn't say it sotto voce, but sotto-sotto voce, loud enough for all to hear.
Like sotto voce (commenting softly so that the third-person subject of the comment cannot hear the comment),
but spoken loudly with the intention that the third-person subject will hear that he is being spoken about.
A reversal of sotto voce: sotto-sotto intended to mean a loud voice.
Person 1 speaking to person 2 with person 3 in ear-shot (the subject of the remark):
In sotto-sotto voce: "Someone doesn't know their place!"