No, that’s absolutely false. It may be common among the upper class, but it is also common among larger families, strongly religious communities and many immigrant cultures, all of which are definitely not upper class signifiers.

I have vouched for your comment because it's a completely reasonable observation and I have no idea why it was dead.

That said, ...

Edit: I'm tired. I've redacted argument here. Let's just say I did use a qualifier and let's leave it that.