It's mostly his response. As scum he tends to distance, even bus, his mates. As I was interacting with him, I wasn't really getting the impression that he was operating under any nefarious agenda - he could for example have just retracted his Michelle idea and buddied along, or he could have doubled down while trying to sell me on it, and instead he just went at me over it. That by itself doesn't mean much, but it does bring into question what his goal on this would be. I mean if Michelle is town like I think he is, all he's doing is sinking his own threadstanding by aggressively deflecting this way. Overall, it gave me the impression that he was uninformed.
I do think there is a strong element of OMGUS to his play, and his reasoning seems to come entirely from that, but that's something I anticipate from him as either alignment so when I factor for that, his responses don't seem bad to me. Logically I wouldn't call them sound, I just don't think he's scum for it.