...and plurals are not formed with an apostrophe s. (...as in "plural's.")
There. I'm in the parade, too!
(I had to Google "yolo," incidentally.)
Some words/terms just look "funny" with the apostrophe in the correct position.
Example: "I grew up in the '60s" is the correct form, but most common usage puts the apostrophe in the wrong place.
Another one is with the rampant use of acronyms, the plural doesn't look right without the apostrophe. Even with a lower case "s", it just looks odd.
ah, but my beef isn't with those oddities - it's with the more-and-more common formation of a plural by adding " 's " to any singular noun - such as a local sign advertising "Christmas Tree's."
My son is an English teacher... gonna give 'im hell.