One of the intresting things we are taught about unconscious bias, is besides people actively discriminating agianst outer groups, most people simply reserve postive emotions for inner groups leading people to be kinda like this without really realizing it.
So remember don't just reconsider your views on natinoalism, but consider everyone else probably has unconscious prejudice agianst others, so don't just attack them for thier views but at least try to educate them.
Then if they continue to be willfully ignorant shrug....
This is what our prehistoric ape ancestors on the western plains thought of our prehistoric ape ancestors on the eastern plains half a million years ago. .... stupid eastern plains apes >:(
Hot take: if someone says "my country has the best ____" and has not ever lived for an extended period in another country, you can just ignore anything they have to say.
We were deeply brainwashed to believe we were the best and discovered the world. Never were we enlightened about we being at fault for bootraping the slave market across the Atlantic. Ups, a silly omission in our history lessons.