[asimilator]

> E.g. the school told me that I belong to some ethnicity and that there are other ethnicities I should know about. As a child I couldn't care less. Why would they tell me this if ethnicity doesn't even matter for future job?

I don't think you could have even a basic understanding of history without understanding what ethnicities are and some details about the historical experiences of at least a few of these groups.

But let's buy in to the premise, for a second, that schools should only teach you things you need to get a job (which ignores how important a well educated population is to democracy). Historical discrimination and the current disadvantage of several ethnic groups directly informs the hiring policies of many major companies (in the US). So ethnic groups may directly impact you getting a job.