Oh god, not this "there is no normal" crap. I even heard this from a shrink recently.
Sorry folks, but you have normal defined wrong. Normal would be what you typically expect of individuals. If it is normal for people to not be "normal", then that is what the norm for normal is.
Most people expect a lot the same things from people when it comes to interaction. Sure, they don't know exactly how that person will do it, how they will dress or look or sound, but they can expect, for example, the person wont be picking their nose when coming up to order a burger at McDonalds or something. Why? Because it IS NOT NORMAL to be just picking your damn nose in public while ordering a burger.
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Permanently inane.