A friend wants to appear offline in game because he is a streamer and has been getting stream sniped by a multiboxer for almost a year and its ruining his stream. The problem is that although it’s possible to set his status to appear offline in the Battle.net app, his status is showing as online in game, and the stream sniper can see whenever he is queuing.
I have looked around this is the only thing I’ve found that looks somewhat official on the topic: https://www.reddit.com/r/starcraft/comments/8n1ddh/appear_offline_in_starcraft_2/dzs54yp/?context=2
UPDATE: There’s also this: Appear Offline for Battle.net Friends - Blizzard Support
So, I don’t know if this is a bug or some kind of oversight. It just makes it impossible to do anything about stream snipers.