That is when Barnes found out he had misread what he thought was a offensive word as it was actually an abbreviation for the type of sandwich it was - bacon, lettuce and tomato with cheese.
The server told him: ''Because you ordered a BLT with cheese?' To which I replied, '...Oh.''
Since sharing the post on September 10, it has received more than 150,000 comments and 74,000 shares.
Many Facebook users found the post "hilarious" and agreed that it was a very funny incident.
"That's really funny, you should have told them to write the words not the letters because when I look at it, I got another word hahaha," one person wrote.
Another said: "Imagine if this was for real."
"Nah that was also subliminal lol there are other ways to write that lol," one person added.