It must be commented that the same kind of stereotypes applied to french metropolitan, with deadly consequences :
In 1914, the offensive on Metz was a terrible defeat for the French, and scapegoats had to be found.
"Of course", the french high command was very good and did a great job as they have always done since Napoleon (especially in 1870), and they would always do in the future (especially in 1940)
One regiment involved was from Lorraine with lot of solidiers who had fled occupied Lorraine, so they could not be responsible for the defeat.
The other regiment was from southern France, and southern french are very well known for their lazyness (southern indolence) so they they were held responsible and several soldiers from those regiments were shot.
But to answer Dutch_P47_M, there was a difference between the metropolitan and the colonized people, is that through education they had a real hope of accessing some better positions such as teachers.
Basically a small part of "giifted" young boys (and girls to a lesser extent) could access a better social rank through situation.
For the colonized people, this was nearly impossible with very very few exceptions.
I am talking about France because I know the situation but it may be the same in other European countries.