You've obviously never been a cashier who only speaks english. I have been yelled at and cussed at (I know those spanish words) because I don't know Spanish. I have also tried to eat at a fast food restaurant across from college campus I attended. They did not even understand the menu items in English (and the menu was printed in English). I literally had to leave without ordering because they could not understand "hamburger and soda." I had been turned down for a position at this location simply because I don't speak Spanish (note: being bilingual is a legitimate job requirement, but emphasis on the bi).
At the fast food job that I did get, workers who did not speak english worked in the kitchen (not direct customer service positions) and I actually learned a fair amount of spanish when I worked there.
Note that this meme is specifically about direct customer service positions and relates to the ability to speak English, not the primary language spoken.