See, these are reasons why even after he'd allied himself with Decepticons he kept his distance from them, with the exception of his handler. Too many of them had this sort of personality.

"Yeah, that's what I just said! It's common." The harm of outing himself as a double agent to a Decepticon was fairly small, but drunk mechs were unpredictable. For all he knew Spinister was one to shout. Considering Rodimus was already suspicious, he didn't particularly need to be affested at the party.

"Maybe I just liked the design. I have to look my best and all."