No, if someone tells me they're "neutral," I assume that they're against me.
Basically, I'm saying there are two categories of players: those who are working with me, thus ensuring I have an interest in their success, and those who are not working with me, thus ensuring I have an interest in their failure. Sure, you could divide the second group into those who are actively working against me and those who are merely not working with me, but the point is, I have a vested interest in seeing both of those groups fail.
Say I'm France, and England says to me "Well, I plan to play neutrally between you and Germany." My response is to write Germany and say "let's take down England together." Unless he wants to run a Western Triple or something, I'm not interested in a neutral neighbor. If we're talking about Austria being neutral toward my dispute with England, I don't care; he's too far away at the beginning of the game to matter, so it's a reasonable position. But if he's a neighbor, and he's telling me he's "neutral," I don't class him as an ally.