What level of society would Mark realistic vernacular portray?

It's difficult to definitively say what "Mark realistic vernacular" refers to without more context. Could you please provide more information?

For example:

* What is the specific context or situation? Are you talking about a character in a story, a real person, or a specific genre of writing?

* What kind of vernacular are you interested in? Are you looking for slang, dialect, or just everyday language?

* Do you have any examples of what "Mark realistic vernacular" might sound like?

Once I have more information, I can give you a more helpful answer.