Sorry, but Katy gets what she deserved for that comment about Miley. Katy has NO room to talk about tongues with her dating Russell and John who are KNOWN for their countless hookups. Sorry, but she had no right to diss Miley.
Since Miley is probably a big lamb (as she follows her on twitter even though Mimi doesn't follow back), she was probably reprimanding Katy for having mean words to mariah.
Lmfao isn't she telling her that she should be glad she broke up with John since who knows where his tongue has been? It sounds more like John shade than anything.
Of course it's not exactly a classy tweet, but they're friends.