"You're out of your depth" is an insult to someone with an excessive ego.
If you're not actually out of your depth, you won't be insulted by it.
I don't get insulted when someone says I'm stupid. Because that is not true, and I know it isn't true. It isn't the things we know to be untrue that insults us - it's the things that we know to be true, that we can't accept - or even worse - can't see about ourselves that insult us.
> or even worse - can't see about ourselves that insult us
Isn't this the point of the previous comment? That the WN thinks they're not out of their depth and can't see that about themselves. So it is an insult from that perspective.
If you're not actually out of your depth, you won't be insulted by it.
I don't get insulted when someone says I'm stupid. Because that is not true, and I know it isn't true. It isn't the things we know to be untrue that insults us - it's the things that we know to be true, that we can't accept - or even worse - can't see about ourselves that insult us.