[Jamesy]

His behaviour towards Pav has made sense. Ex housemates gave them info that Pav is not to be trusted and is 'playing a game'. No one has challenged Pav against this and Chris probably thinks because of this info then the public must hate Pav. So he goes to challenge Pav to look like the hero going against the villain.

I agree with comments above that this is just people going against a favourite on the most minor of things so the others can get ahead of the game.