When I talk loudly, it's to be heard over interference, or it's because I've been doing it for a while. When I'm angry, I talk quietly because I'm trying to get under control.
Telling me to stop yelling won't help. I'm not yelling. I'm talking loudly. There's a difference.
Yelling at me, accusing me of being angry at you or arguing or not listen, and insisting that I talk more quietly will indeed help, in a sort of round-about way.
I will most definitely end up talking more quietly.
On the other hand, it's not going to make me like you one iota more.