Yes, every culture has its own lingo, but it comes about for various reasons......
For example, mB and mB because, well, giga-byte and mega-byte don't really roll off the tongue ...
And many modern text abbreviations came about because they're easier to type ...
For example, "LOL" takes a lot less keys than "laughing out loud" - especially in the old days when many folks were typing on a numeric keypad...
And, while nowadays almost every phone can display a smiley face, not long ago most could not.
Neither of those came about because someone expected you to memorize a long list of secret code words.
(or because they wanted to exclude the folks who weren't interested in doing so.)
All of those sort of evolved - for pretty straightforward reasons......
It does sort of cross a line when it become obvious that the intent is to divide rather than unite the culture...
For example, when a subculture, or an outright cult, develops their own private language...
For better or worse it promotes an "us and them mentality".
(Ever notice how two doctors can talk about you, right in front of you, and they might as well be speaking a foreign language?)
Do you really doubt that your high school aged children feel like they're speaking a different language than you are?
Do you consider this a good thing or a bad thing?
To some folks it starts to feel like you're walking along the sidewalk talking to someone...
Then they start walking faster and faster, with no obvious purpose other than "seeing if you're willing to run to catch up with them or not"...
It begins to seem like someone is thinking: "Let's invent a new language and see if the old fogeys are willing to learn it to avoid being left behind".
(And, to put it bluntly, when it starts to seem as if many of the users of that new language were never required to pass an English exam, it starts to seem a bit odd.)
Every culture has its own lingo. The only people who get mad about that are the people who feel left out of the "reindeer games". But you become a part of a culture by embracing it, not demanding that it conform to you.
