Disclaimer: I am not a grammar/spelling fanatic. Just thought this information might be useful. [Plus I want to do a short "practice" FanPost to see how it works.]
So, I have read several posts/comments, etc., on various sites and forums where someone says "the discussion is mute."
However, I think the various writers meant to say "the discussion is moot."
Without getting all dictionary, a discussion is "moot" when circumstances change so drastically that continued discussion is pointless, without value, almost to the point of being illogical.
Example: if two people are arguing over who owns a pile of sugar and then it rains so that the sugar melts irretrievably away, then the argument has become moot. An argument about the ownership of nothing is beyond a waste of time, unnecessary, illogical.
Now, on the other hand, maybe a discussion can be mute. But I would suggest it is better to say "the discussion is on mute" meaning: the discussion rages on, but I am not listening anymore.
[Okay, so let's see how this works; preview then hit the publish.]