"Why is discrimination against males politically referred to as “positive discrimination”?"
That is the British term. In the US, it's called affirmative action/ In Canada they call it "employment equity" and in Britain, "positive discrimination" but in the end, it's all the same. They are all job quotas. And the quotas are achieved by denying one group (men) the legal opportunity to even compete for the position. So how is this fair?
These employment quotas are making it hard to respect women as a class when it appears that many of them are simply shunted into positions by denying men the opportunity to even compete for them. We can never be certain if a woman is properly qualified for the job, or if she was simply short-listed due to the feminist lobbied discriminatory policies against men.
Especially in this day and age, where several generations of men and women (boys and girls) have been raised in the spirit of equality and opportunity with full equal Rights. Almost no woman alive in the first world has ever suffered legal discrimination. Now remember, AA is legal, state-sanctioned discrimination against men. We are moving backwards at the hands of the feminist lobby.