That's what eugenics is, at its core. Whether or not one imposes beliefs of eugenics on others is another matter.

"the study of or belief in the possibility of improving the qualities of the human species or a human population, especially by such means as discouraging reproduction by persons having genetic defects or presumed to have inheritable undesirable traits (negative eugenics) or encouraging reproduction by persons presumed to have inheritable desirable traits (positive eugenics)"

http://dictionary.reference.com/browse/eugenics?s=t&path=/

http://en.wikipedia.org/wiki/Eugenics

There is no "what it is", just what people understand the term to be. It is, quite frankly, stupid to use a term as loaded as "Eugenics" and then get upset when people don't manage to realize that you're using it to mean something completely different from what it's commonly understood to mean.

Godwin's law, pal..