I have seen this scene with all the servants and archer is actually the most polite of all of them, saber on the other hand actually laugh at the idea of hakuno beign her master and didnt think very highly of him when the sealed saber was actually Lovely dovey with hakuno (after some character development of Course) I Know saber Wasnt exactly mean with them (She actually apologizes after laughing) but She was Kind of nasty with hakuno.Just saying