Depends on the person and situation really. Of course for a casual and friendly conversations its fine as long as its not too many. But in a formal setting its rude imo.
I guess it's a fair discussion around abbreviation, words weigh a lot and shortening it consequently shortens its value or the reciever might feel different
"Kuuki Yomenai" or "can't read the room" iirc A Japanese phrase to describe people who struggle to read the atmosphere, pretty hard to localize so I assume they just left it there.