I don’t know if anyone else has this problem, but I often read a diplomacy message and then ponder it (either actively or subconsciously) throughout the day. Somewhere along the line I completely forget about it and it can sometimes look like I’m actively ignoring someone.
Does this happen to anyone else? I know I’m asking the game to accommodate my forgetfulness, but I thought it was worth suggesting.
Mark as unread kind of already exists in the game when someone starts a new message thread with me. I will often read the email notification and let the in-game notification remind me to deal with it every time I log on.