The host said that this week's nominations, which feature Arron, Conor, Deana Uppal and Becky Hannon facing eviction, had brought out bad sides in the two male housemates.
"For Arron and Conor to act they way they do is ridiculous," said Dowling. "Arron says, 'my friends have stabbed me in the back', when he also nominated. 'They mention people's names', but so did he. But they're wrong because he's up. That's just ego.
"We've seen a different side to him and Conor. Beforehand Arron was a prankster, and now we're seeing something else.
"Conor is taking it all very seriously now. I just wish he'd go back to the night he walked in and he looked a lot of fun. That's got carried away in all the drama."
Digital Spy users have tipped Conor for eviction tonight (July 6).
Big Brother continues daily on Channel 5.