On the one hand, he's very manipulative and bitchy (which I've thought from the start) and I feel he picks on Chloe because he sees her as the weakest in the house (and I'm not defending Chloe, I'm sure she'd be difficult to live with).
On the other hand, Bobby was FAR more annoying there. There is nothing that gets to me in real life more than people involving themselves in arguments that have nothing to do with them - in that respect, I'm not surprised that Austin told him to F off. Also, trying to force out an apology from Austin, when it's up to Austin when or even if he apologises got on my nerves as well.