The problem with "payback" is that the pendulum will back again in the future. We need to put an end to the vicious cycle. ;)

So, are you saying that the education of boys deserves to be adversely affected, just because other generations held back girls from attending school? We are talking about the present education of people in our schools here. It would make no sense for the new generation of boys to be punished for something they didn't do, but that society had done decades ago. Revenge (particularly when discriminating against people for their gender, or race for example), is petty.

If boys in whatever country you are from do far worse in education because of these changes you are justifying as 'revenge', then it will badly affect the state of your own country. It just translates into less people leaving school with the qualifications that they deserve, and less highly skilled workers for your country. It is a terrible thing to discriminate against half the population based on gender, and to hold them back (even if it is non-deliberately, or not as bad as it was for girls a long time ago).

Boys don't have it as bad as girls has it, but that doesn't mean that we should ignore this change. It is still discriminative, and holds back certain people (even if it's not such a relatively large effect).