Strange is obviously not very sure about this whole thing. Though it's less about Peridot being the one to say something and more about the whole concept in general.

"Just...phrase it more diplomatically than Lambert's 'we want to kick the Huntsman's ass.' And don't demand to see them. Ask politely."

It's always a good idea to be deferential to the forces that could probably smush you into a pulp if they so chose.