I think that it really is quite fascinating how people read things in totally different ways to another person. It would be great if it was possible to convey something that wasn't open to any interpretation. No matter the skill of the author I don't think it's possible for this to happen (even in real life, no matter on a internet forum!)
It's one reason why if I ever need to have a proper conversation with someone I don't do it via text or email. As has been demonstrated it's very easy to misunderstand something and see it in a completely different light.