THESE PEOPLE ARE NOT OUT TO SAVE "BUZZWORD BANDWIDTH". . . THEY ARE OUT TO CONTROL YOU. . .DON'T LET THEM.
"Netiquette" is something THEY have invented TO CONTROL YOU!
All you have to do is remind them that each individual has a most powerful protection against anything they don't want to see. . .THE DELETE KEY!
You will probably also have to remind them, sometimes in the manner of using a different platform to speak from, if their response is not to post your messages, that: