Honestly no one likes talking in dungeons, RP or otherwise.
For the most part talking is pretty much reserved for anything other than playing the game. (Im not saying i condone it, Im a pretty chatty player myself; when people let me.)
Unless its private, FC or party no one really says much in this game. With discord, party chat, and voice chat options ... even less. Talking in this game just seems to irritate people.
Correction, TYPING in this game just seems to irritate people.