Lucifer just laughed. He wasn't offended. Dean knew so little of his life - he'd only been alive for a tiny fraction of it - that his insults meant next to nothing.
"Yes, yes, Dean, be on your way. And before you talk about the chips on my shoulder, perhaps you should remove the ones on your own. And don't you try to pretend you don't know what I'm talking about."
He, after all, might be slightly willing to let the past go. Dean, clearly, wasn't.