It’s not always apparent, and is often poorly understood. Stated succinctly, stupid is not your fault – you were born that way. You’re just dumb. You can’t learn.
Ignorance means you just don’t know. Ignorance probably is your fault, because you’ve failed to inform yourself. This is especially true since the advent of the internet has enabled the most universal and thorough dissemination of information in the history of human communication.
The obvious problem is that 95% of that information is wrong….