@digga articulated this well elsewhere:
There are acronyms in common usage in the world or on the internet that are easily looked up (also in professional fields — eg accounting principles, as in the compilation of GAAP or “Generally Accepted Accounting Principles” — Generally Accepted being the key phrase).
Then there is what one or two people make up while giving the impression that everyone should know what they were imagining when they made it up.
Not the same thing — and implying a clubby, fratty, fake cool, false exclusivity and propagates the impression that you need to be “up on the lingo” to participate.
There are bullying studies in kids that demonstrate how language and lingo are employed in exactly this way. Not that different a practice in adults.
The one-off acronyms require several more replies to spell them out anyway, so the only reason not to use the words in the first place is to create a situation where someone feels left out enough to ask them to be spelled out, or bizarre narcissism where someone has a desire to be constantly asked what on earth the random letters they strung together mean.
