I think "manipulation" implies sneakiness, not just influencing somebody. If I tell you that I disagree with your comment, and me saying that is enough to change your mind, then I have influenced you but not manipulated you because I've done nothing but tell you my honest opinion with no unannounced motives.
What I was trying to get at was the concept of mutual benefit in thinking. For example, my thinking is better because of your comment. If we want to think together - create some good thought then the focus is on understanding, not influencing or manipulating.
But yes, you can and did influence me. Or perhaps more accurately, your thinking about this helped me think about it better and more clearly. Thanks!