Well he didn't come here for an actual conversation, he came here to be mad. Now he's just putout, arms folding over his chest. So now he's just left trying to walk through something. Words and a broken-layer of glass level of feelings.

It's not flattery. "I don't think Castiel tried and apparently failed to kill him so it's really not the same thing."

He not. Actually sure. If Michael knows what Lucifer tried to do to Gabe. He assumes, if only because Michael was hyper-aware of most things and he was still roosting up in Heaven, vesselless, all high and mightily divine. Like an asshole.