Is there really a difference? I feel like if you don’t know something, that kind of makes you stupid, right? If you don’t know historical facts or mathematics—at least the harder stuff, like algebra or calculus—or if you don’t know about advanced political topics, then you’re kind of a stupid person, not just ‘ignorant.’
There are different kinds of stupidity and ignorance.
And yes, there are lots of differences. Often the stupid person is the person who expects other people to not be ignorant of what they know, and makes other people feel stupid, and thus destroys any chance anyone has of learning from each other.
Lots of stupid people, can’t admit their ignorance. And lots of people can’t admit they made a mistake, and thus remain ignorant.