Yep, I hear you.
At my work, we had a meeting at which proper business communication was discussed. One of the things mentioned was that business letters and other correspondence such as email should be in formal writing, and not to use text message style abbreviations.
Business communication and etiquette needs to be trained. It’s worth hiring a consultant/trainer for this, and I have done so in the past. My people loved it.
I continue to be amazed at the ongoing misuse of “reply all” in business email by people of all ages who ought to know better, for another example of a problem in this area.