 This makes you come across a bit stuffy, not cool or hip. Two, proper punctuation. Periods and commas are super polite, but can be read as rude to Gen Zers who only use them when they're being serious. Three, using acronyms from the early internet days. Do you still LOL? Yeah, stop that. And finally, four, you double space after periods. If you learned how to type on a typewriter, you might do this. No clearer sign that you also know how to use a fax machine, a VHS tape, and a page or two.