Globalisation innit.
What are memes? A medium for instant distribution of popular culture.
Who's the main audience of memes? The yoof.
Where do the yoof import most of their other mainstream popular culture? America. Its natural that there's bleed across.
Why are memes captions/formulaic social media posts nowadays often written in African-American dialect ("x be like/be all..." etc)?
And is it normal to find it annoying/false-sounding, especially when it's from white British people?