Educated, as in having earned a post secondary degree. If you've never been to an accredited college or university, attempting to describe the necessity of proper grammar to you is like trying to describe color to the blind. And you're surprised the landlord wants you gone.
I love when people talk about "common" sense and college degrees lol.
I agree, just because you have a university degree it doesn't mean you have common sense.
However, just because you don't have a university degree, it doesn't mean you have common sense, either.
Degree or no degree does not automatically imply common sense. I do not think anyone ever said it did. I know plenty of people with PhD's who have a ton of common sense. I know people with PhDs who have absolutely no common sense. Guess what, I also know people with no college degrees who have no common sense. And I also know other people with no college degrees who have a lot of common sense.
I often find people that don't have college degrees will often use this that line, "People with college degrees don't have common sense." I don't know why they say this. I don't think there has ever been a study that studied the relationship between common sense and whether or not someone has a college degree.

Plus, you'd need to define exactly what "common sense" means. Is it street smarts? Is it the ability to solve real-world problems? Is it social skills? Is it the ability to regulate one's emotions during times of distress? Is it the ability to navigate the intricate relationship between individuality and communal life? Is it the keen ability to address ethical and/or moral situations by taking into consideration one's subjective experience, as well as the subjective experience of the other? Common sense can have varying degrees of meaning. In fact, there are many people who run street gangs who have a lot of common sense when it comes to street smarts. These people are able to solve issues within their gang, address problems, and devise a tier-system that allows them to profit from gang life, i.e., much like how businesses are set up. Its actually quite impressive (only if they can use this to benefit humanity). I'd say you would need a lot of common sense for this. Then again, people in gangs often lack the empathy to subjectively respond to another person, as well as an inability to balance the need between individuality and communal life, both which would need a certain amount of common sense. Furthermore, we need to take into consideration the context of "common sense." Different contexts will illuminate different parts of the self, which may or may not be associated with different degrees of common sense. Shine a light on a diamond and it will illuminate different facets of the diamond, however, if you change the direction or strength of the light, different facets of the diamond will become illuminated. The self, composed of alternative identities, will respond in the same manner. Different contexts, relationships, and systems will illuminate different strengths or degree of common sense. Thus, most people do not really ever lack common sense (maybe the rare person does). They just manifest different degrees of common sense based on the context.
The dichotomy between "university smart" and "common sense" are not mutually exclusive. I suspect that both terms are more on a continuum, as opposed to either/or. That is how most things in life are--its hardly ever "youre solely this" or "youre soley that." Its more of a blend of constructs (good or bad, university smart or common sense, happy or sad, etc) that make up each person's personality.