[neumann_alfred]

What on Earth has "yelling while playing" have to do with "yelling at a person" --- ?? I am truly tired of all these strawman being trotted out. Some actual replies would be nice.

He will talk with other children but not yell. [..] Lots of children also behave like my son.

Does he also not ever squee real loud for sheer excitement? You know, humans only have a short window where they can even experience the world that intensely. Sometimes it's good to let them.

I also think that if you make clear the boundaries for children, they will honor them.

Yes, but I think it's important to have good reasons (there's plenty for "don't yell at people", not so many for "do not ever, under any circumstances, exceed this loudness threshold while playing"), and to be honest about them; like you are, and like the OP decidedly isn't. Even just "you cannot understand that yet", if it's actually true and spoken in a bond of trust, can be enough. But "the magic pixie dust in the computer has spoken because I can't be arsed to tell you to shut up while I leave you alone with the computer?" Nah.

[aurelianito]

He does not yell while playing at all. A part of it is that he sees no need nor utility to yell (or cry) in order to get what he wants from me, so he did not learn that he has to yell to achieve it. I do think that children can be loud sometimes but, if it is too often, I would also look for the way to stop them from yelling, even while playing.

And I do agree on the fact that telling lies to your own son is counter-producing. He will learn that you lie and not take into account what you say.