I'm not aware of any meme with the usage of "'murican" that paints certain part of the US as parochial and unintelligent.
In any case, that's not what I intended. My usage of "'murican" would have been closer to the joke about Canadians always apologizing than your reading.
I'm about the farthest thing there is from a SJW, but have you considered how people will interpret your use of the slang "`murican"?
To me, it sounds like a reference to a meme which paints persons from the southern part of the U.S. as parochial and unintelligent.
Have I misunderstood the reference?