If you read the original post you'd understand why this doesn't work. I'll repeat it just for you though. Making voice chat join default makes that culture of teamwork and cooperation the standard and norm. It's an MMO, you have to get on with people to achieve things.
If you really don't want to do that, you can leave.
If there's someone screaming down the mic being toxic, which will be very rare, you can mute them.