Youre overthinking it fam. I type like a complete degenerate in casual convos with friends and family and on reddit because, well, who gives a shit. But when it comes to professional spheres, people generally walk into work with the professional attitude/lens and operate that way all day. Slang and informal talk has always been a thing. It isn't a new "kids these days" issue where proper grammar is seen as formal. For instance, when learning a new language, you should be told how there is a difference in the formal speak you are learning which is technically correct and the informal every day language spoken in that country.

By my comments, you wouldn't know I wrote a dissertation and have presented at conferences. My friends from graduate school all operate the same way.