system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] How are wizards so ignorant about the Muggle world?

Throughout the series, it's shown that wizards have television and live in areas where the majority of the population is Muggle.  Given this, how do wizards remain knowing so little about Muggles?  They don't know how to dress to blend in, they don't know how to drive or how any  Muggle inventions work, and most damning of all, they don't know what a gun is.  

I pick these three things because to me, they seem to be common sense things to learn.   I can understand why wizards might not care much about driving since they have the Floo network and broomsticks.  And learning how to properly dress like a Muggle isn't that important (though you'd think wizards would pick that up through cultural osmosis), but not knowing what a gun is or does is downright dangerous.   The Daily Prophet has to explain to its adult audience that a gun is "a sort of metal wand Muggles use to kill each other" implying that most of the population has no idea what it is or does.  Which depending on when wizards started to isolate themselves from Muggles doesn't make sense since humans have had guns for centuries and wizards have adopted trains for their magical use.
gpt
You have to understand one thing, Wizards are stupid. And for the most part it's not even there fault it is how there society is build up.

Look at there education system. They have 7 years of elementary school which they start at age 11 and that's it. Yes, yes it is in a luxurious boarding school but that doesn't change the fact that it is basically the equivalent of elementary school for muggels.

Compare this two system, on the one side you have muggels, which start education at age 6-7, they get elementary, middle school, high school up until age 18 and after that in most countries of the developed world you have free higher education. That means that a good chunk of the population has eighteen to twenty years of learning behind them. 

And such a thing shapes the society as whole you live in, for as asking question, being interest in how stuff works, having arguments and discussion about different possibilities is natural and completely normal.

Now look at the Wizard society, only elementary school for seven years starting at the age of 11 and then maybe two to four extra years training in a speciality. Ta da! You are a mature member of our society. That has its toll. Wizards are not curious, Wizards don't have the need to explore (bah the only job having to do something with travel as far as we know is grave robbing), there is literally NO change in there society which wasn't somehow inspired by a muggleborn. They are dumm and ignorant. Ad to the fact that they are a much much smaller group so they will have statistically a lesser number of intelligent people (especially with all that inbreeding going on), they don't properly educate, and they are by design stagnant and stopped in there culture.

No surprise that they are ignorant about thinks that are not right in front of them and don't have anything to do with making there life comfortable.