Hey guys simple guide on how to appear offline on battle.net without having to remove your friends
All you need is Windows Firewall, so make sure that is enabled.
then open up your start menu and open Windows Firewall with Advanced Security
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Then go to make a new rule on the OUTBOUND RULES, set the port to 1119.
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Log into the game and at the Character select screen turn on the rule
NOTE: YOU CANNOT LOG INTO BATTLE.NET IF THIS RULE IS ENABLED. IF YOU GET DCed YOU HAVE TO DISABLE RULE BEFORE LOGGING IN.
And there you go, no one will ever bother you if you don't want them to again.