Even in primary school I would get in arguments with liberal teachers.

Haha same here. I remember child me interrogating a teacher who insisted that America wasn't a melting pot, it's a "salad bowl".

That was an art class where we were supposed to be coloring the color wheel and making things out of clay.

The melting pot idea was just brainwashing too but it felt more innocent and optimistic. The best you can do with multiculturalism.