grammar - Is "Me" instead of "I" as a nominative pronoun actually acceptable?

TL;DR;

Has 'Me and whoever' long become acceptable usage in informal speech?

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In the comments on this answer on ELL, I corrected the usage of "me" instead of "I".

"My boyfriend and I.. " 😁

However, the original answerer¹ claimed:

in informal speech 'Me and whoever'² has long become acceptable usage. I think we've gotten over that one now :)
_{Emphasis mine}

Fumblefingers is "fairly relaxed about such things" as they mention here, however a sample size of 1 is not really authoritative. Most other answers I found both on ELU and other arbitrary Google searches seem quite set on upholding this rule rather than relaxing it.

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This ngram seems to claim the opposite. The "correct usage" seems to be growing.

Is the ngram biased as its corpus is published works and probably less informal?

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Have we really got over it? It seems that there are a good deal of people who are resistant to the change in my quick search but maybe I'm not looking in the right places.

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<sup>1. A clumsy word to my ears, but apparently a real one
2. I'm dying to change this to "me and whomever"!</sup>