The twins can't communicate without being combative. They can't bring a simple issue to someone and discuss it calmly. They thrive on each other's negativity. They are also too defensive.
For instance, one of them snapped on Nivea for no reason just because she was there.
Also, when Nivea was trying to explain that their delivery hurt Irish's feelings, they decided to deflect and talk about their feelings being hurt instead of apologizing. That's not how adults are supposed to have productive discussions.
And someone was right about them acting like they have ownership over the songs. They probably do legally, but they always want to make decisions unilaterally about the music instead of bringing it up to the group and letting them decide.
Like I said, next season should have a voting mechanism beyond the useless "queen" vote. They should vote on all decisions for the group and music.
