So today I read this post.
I have had several coworkers in my past go out of their way to use acronyms. One just seemed to love it and when he spoke it was like he'd spilled the alphabet. He just did it to seem like he knew more than you and inflate his ego.
One time, he told me there was a site I needed go where they were trenching in preparation for laying RCP. I know I looked confused, and he said, "You know what RCP is, right? Round Concrete Pipe." He used an acronym to save one syllable.
A few years later, at a different company, I learned that RCP actually stands for Reinforced Concrete Pipe.
Now first, that's a three syllable savings, so that makes sense.
Second, he was wrong, and I felt much better about myself.