I’m aware that I’m ignorant in matters of quantum mechanics, and I’m deliberately keeping it that way, because I’m simply not interested in learning about it.

That’s not malicious of me.

I agree. Entirely.

If you were to then advocate against QM, decrying it as nonsense, that would be malicious ignorance.

An example from my own school years might help. I had some smart (genuinely very clever) friends, they were evangelical Christians, which was fine until we start studying evolution in biology. They literally repeatedly stood up in class and shouted that there’s “no proof of evolution” and got very angry. They did this because their child-aged minds couldn’t reconcile their faith in their literal interpretation of their holy book and scientific evidence. They reaction was to maliciously attack science as a whole. That is malicious ignorance.

A counter example is a colleague from years ago, a young-earther Christian, never once attacked any contrary opinions or statements. He was really cool, open and honest about what he believed, had absolute confidence in his faith, didn’t push that on anyone.

I’m not trying to claim that all ignorance is malicious, and apologize if that’s how my previous argument has come across.