Why do little people find the term "midget" offensive?

Midget
–noun
1. (not in technical use) an extremely small person having normal physical proportions.
2. any animal or thing that is very small for its kind.
–adjective
3. very small or of a class below the usual size.
4. being a miniature replica or model.

Dwarf
–noun
1. a person of abnormally small stature owing to a pathological condition, esp. one suffering from cretinism or some other disease that produces disproportion or deformation of features and limbs.
2. an animal or plant much smaller than the average of its kind or species.
3. (in folklore) a being in the form of a small, often misshapen and ugly, man, usually having magic powers.

Midget sounds better to me. But I guess I don’t really have any say