Who decides whether they are relevant or not?
Just because a reply is addressed to a certain person; the unknown other readers are always in the back of my mind when I compose my responses.
Who decides whether they are relevant or not?
Oh come on. It was irrelevant to what I was saying, and I said so. You are free to infer whatever you want, but if you quote me and ping me I am equally free to respond pointing out it is irrelevant. How would I have less freedom to consider the "unknown reader" in pointing this out than you were in saying it? Or, how about looking at it this way, who decides who gets to decide whether they are relevant or not?