Board Thread:Speculation House/@comment-4830106-20140725003808/@comment-10390252-20140728084231

The thing is that we don't know the context. For all we know, Ruby has been making Weiss suffer for the "In no way does this make us friend!" for pretty much the entire first semester. It could be a long-standing tease between them now.

FWIW, I suspect that it, along with most of Ruby's dialogue in that scene, were just throw-away jokes.