They’re, Like, Way Ahead of the Linguistic Currrrve

[Odin2005]

20. No even in casual speech? RIIIIIIGHT...

You don't THINK you do, but I am sure you definitely do.

I have noticed that educated speakers from a working class background, such as myself, switch back and forth between formal and colloquial speech forms automatically depending on the situation. In informal speech I have dialectical grammatical peculiarities (like spurious -en endings on irregular past participles: boughten, caughten, etc.) that are dropped in formal speech, it's called code-switching or diglossia.

Oh, and there are no such thing as "correct" and "incorrect" for one's native language, there is standard and nonstandard. the nonstandard forms are the REAL, living language, the standard form is a fossilized construction of prescriptivist grammarians who often have stuck in rules, like "no split infinitives" that were never part of the actual language.