Did we not learn how to use the apostrophe in middle school at least, if not elementary school?
The apostrophe does not denote plurality.
The apostrophe is used for three purposes: to mark the omission of one or more letters, as in a contraction, to mark a possession, and sometimes to mark non-English plural words. (P’s and Q’s.)
Using an apostrophe to form plurals is grossly incorrect.
It’s hard to take someone seriously when they use incorrect punctuation.
“The cat’s whiskers” is appropriate, while “The cat’s whisker’s” is not.
Or another example:
“I can’t come drink beer. I’m hanging out with the girl’s.”
“You are hanging out with the girl’s what?”
“With Lisa, Katie, Jane, and Emily.”
The rules for apostrophes are not hard to find, if anyone cares.