The MEME is ENTIRELY ENGLISH -- **not** German.
It's entirely understandable that someone whose NATIVE LANGUAGE is NOT ENGLISH wouldn't know what the ENGLISH word BIER means and THEREFORE WOULDN'T GET THE PUN--even many NATIVE ENGLISH SPEAKERS don't know.
THAT'S why the meme says EXPRESSLY "I didn't misspell it -- LOOK IT UP." AND I included a link to the Wikipedia article EXPLAINING WHAT THE ENGLISH WORD MEANS.