Ever since Rachel apologised to Kat for nominating him, Rex was like a dog with bone.
He re-started the argument that Rachel is a fake housemate, agreeing with Kat, and liking the people Kat likes.
This time Rachel hit back by telling him some home truths.

She nominated Nicole TWICE
She distanced herself from Nicole because she was negative.
Rex treated his friends in the house badly while his grifriend was there.
If she was given a third choice, she would have nominated him before.

This doesn't sound like someone who agrees with Kat.

In this person's opinion, Rex's allegations very soon ran out of steam.

Good on Mikey for backing up Rachel, not that she needed too much help this time.

No one else said anything, and she was also speaking on their behalf.