First of all, you have to consider what happens when you "bump into" everyday matter. The interaction between you and that matter is all done via electromagnetic fields. The electromagnetic fields in the matter interact with the electromagnetic fields of the matter which you are made of. So the "solidness" any object is just due to this electromagnetic interaction. This electromagnetic interaction is also responsible for the objects interaction with light or any other frequency of the electromagnetic spectrum. They are reason they glow when hot or absorb, reflect, or scatter electromagnetic radiation.
Dark matter, by its very nature, does not interact with light in this manner. It is completely lacking in electromagnetic interaction ( like the aforementioned neutrino). Thus it also would not participate in the type of "bumping into" interaction everyday matter does, and thus passes right through you pretty much like you weren't there.