People who act like talking loud is an innate quality they can't control
"Sorry I talk loud!" Great, you've identified the problem and displayed self awareness. Now practice self control. The volume of your voice is 100% controllable between silence and however loud you're capable of talking. Im right next to you, you dont need to yell, and also nobody else wants or needs to hear your business.
Edit: people in the comments who think this is genetic are the exact people I'm referring to
Edit 2: always exceptions, like for people who are hard of hearing, or when working in a loud environment that requires it, etc. But those aren't genetic.