“Inverted commas?” Really? Do they not call them “quotation marks” or “double quotes” in Norway?

‘ = single quote
” = double quote

‘/” = quotation marks

Second: Misusage of the apostrophe-s construction probably comes from modern people combining languages that really have no business being combined, such as in your example, and not knowing how to pluralize them. For simple readability, they go with an improper (but easily understood) usage that keeps the challenging word (gwai lo, in our example) in it’s simplest, least likely to be misinterpreted form.

I thought all gwai lo’s knew that.

“fucking white foreign guia lo’s should just stfu, give up, and fuck back to america. they dont belong no where near asia. ”

“White foreign guia lo’s” as opposed to local ones, I presume. But “lo’s” what? What??? No. I expect, nay, DEMAND an object after apostrophe s!

We “all” have things that “annoy” us about language. My “current” pet “peeve” is people who “over-use” the word ‘literally’.

“It was so funny, I literally died.”
“I literally laughed my pants off.”
“I literally can’t wait a second longer.”

Sigh.