Carrot-top, copper-top, ginger-nut, ginger minger, Duracell, Ronald McDonald. These taunts can make people's lives a misery.
If race is defined as:
an arbitrary classification of modern humans, sometimes, especially formerly, based on any or a combination of various physical characteristics, as skin color, facial form, or eye shape, and now frequently based on such genetic markers as blood groups.
Then we can assume that racism is hate or intolerance of another human being, primarily because of the way they look.
I don't know whether 'gingerism' could be classed as a form of racism, likely not, but do people acknowlegde that it is as bad as racism?