"You haven't known me very long," he pointed out with an actual point. He was mostly playing devil's advocate but also entirely right.

Sure, Newt didn't go out of his way to be an asshole. He knew he could be one by accident more often than anyone would like. But that didn't make him kind. He would absolutely keep money found on the street and ignore beggars unless he wanted to get rid of some change.

"I'm only nice to you because you're hot. And have cookies."

Now that was definitely a joke. Mostly. There was a good chunk of truth to it.