Imagine you are walking in London and someone suddenly shouts at you for no apparent reason! You might say to your native English friend: "He is badly educated". Your native friend would probably understand you but at the same time probably think that your comment was slightly strange.
The reason that it is strange is that native English speakers don't really use the phrase "badly educated". Instead, the most common way to say what you are trying to say (maleducado) is: "rude".
So you could say: "He is a very rude man!"
In English, you can use "bad education" but it would mostly be connected with something like the "education system" and therefore would be, for example: "In England, we have a bad education system"
Hope that helps!
Soy el director de Daniel Smith + Partners. Tengo más de 10 años de experiencia enseñando inglés a españoles.