So the question is when a dialect of English is considered non-grammatical. I am aware that it can be considered non-standard, however some phrases can be to an extent not to be considered non-grammatical. So where the cases in which it is actually considred non-grammatical. Thanks.

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    Every single dialect of English is grammatical within itself. Read this answer to understand what grammar is.
    – RegDwigнt
    Commented Sep 30, 2018 at 22:06
  • @RegDwigнt So technically a dialect can never be non-grammatical if it follows all its own rules (no matter how far apart it is from being grammatical)?
    – user318260
    Commented Sep 30, 2018 at 22:13
  • @Strikers Yes. Grammaticalness is with reference to a particular variety. A phrase can be grammatical in one dialect and not grammatical in another. A dialect can be socially acceptable or not within a given social circumstance.
    – Mitch
    Commented Sep 30, 2018 at 23:47
  • @Mitch Okay thanks, and also to note, it is then considered non-standard.
    – user318260
    Commented Sep 30, 2018 at 23:48