Yep, that is how wars of ideas work. You will have to fight generations of reactionaries and debate against those ideas point for point. Before fascism and ultra-nationalism there was the religious “our religion is better than yours”. This fanaticism still fuels religious tensions and wars in Middle East, but the reason why in Europe we have so much fewer of these tensions is due to hundreds of years of fighting both in ideas and in wars and revolts. And you should give them no quarter, because they will gather their strength and adepts and will push these ideas again. Education is the best prevention against this cancer