A false double foul is separate events. You do not call them but they just happen and have their own penalty. They are not simultaneous in nature either.
The B1 foul of A1 and the A3 taunting B1 is really the only false double foul. The technical foul by B1 commenting to the officials is a separate event.
As stated all would have a separate penalty, but you never actually "call" a false foul, they happen by rule and just are made clear that one takes place and how to handle them. True double fouls go to the POI, not false fouls.
Peace