It is crazy that even today teachers try to teach differences, as you rightly say, instead of working on the concept of equality. I think that these contents should be carefully reviewed. You did well not to stay only with the activity that the teacher pointed out in the case of gender equality, which has nothing to do with human rights and equity. In addition, as you mention, equality is a very broad principle that it is absurd to try to work with children in a few weeks. Congratulations for setting a good example, that is the main thing, learning as a family is based on the example that our actions generate in the little ones.