Racism is racial prejudice coupled with a a degree of power which is used to deny rights of those from OTHER races.
A white British man could say "I hate all Germans and won't employ them in my company".
Technically, he could be prosecuted under the relevent race relations act, but essentially, that makes no sense - as they are both of the same race. There is no such thing as 'a race of Germans'. It is 'a nation of Germans' and so on.
The above is an example of nationalistic bigotry, or perhaps xenophobia.
It's not racism.
Current thinking suggest that there are three main races in the world:
the Major races are.
Caucasion:
Skull: Dolicephalic(Long-Head),High forehead,Little supraobital development.
Face: Mainly Leptoproscopic( Narrow)Sometimes Meso- or even Euryproscopic, Neither Facial nor alveolar prognathism occurs except among some archaic peoples.
Nose:Long,narrow,high in both root and bridge.
Mongoloid:
Skull: High incidence of Brachycephaly(Short Round Head)
American Indians while Mongoloid are often Dolicephalic.
Foreheads slightly lower than that of the Caucasoid.
No Supraobital development.
Face: Wide and short, projecting cheek bones, Prognathism rare. Shovel shaped incisors common especialy in Asia.
Nose: Mesorine(Low and Broad in both root and bridge.
Negroid:
Skull: usually Dolicephalic, a small minority are Brachycephalic.
Forehead most often high, little supraobital development.
Face: Leproscopic (to a much lesser degree than the Caucasion), Prognathism common in most Negro populations.
Nose: Low & broad in root and bridge with characteristic depression at root.