Pretty soon John Cena won't be able to insult anyone.
He shouldn't be allowed to currently.
Let's break down how damaging his "He has no pearls in his pants" jeer is.
Quick and dirty, it means he has no balls. That means Cena is saying Wyatt isn't a MAN, and isn't part of this "what it is to be a man" social construct that Cena's been reinforcing over the years. In suggesting that Bray Wyatt doesn't have male genitalia, not even just the penis but the actual organs that produce children, he can't advance the patriarchal society if he's having sex with (assumed) women.
So, Cena sings this and Little Jimmy says "hey, these balls of mine are what makes me a MAN." and drags that patriarchal viewpoint into his daily life, which may include bullying of others - continuing the cycle of hate and admission of "if you're not a MAN, you are nothing."
Little Jenny on the other hand hears this and says to herself, her impressionable mind, "I don't have these. Am I nobody? Can I not stand up and fight? Am I a weakling for not being born that way?" and it haunts her entire childhood. It calls back to anything she's ever experienced from a male-dominated society and reinforces the basic phrase "you are nothing unless you are a male" that John Cena is more than happy to perpetuate.
Cena should stop with these jeers. It's damaging, and that's just the kids. Never mind parental pressure telling kids to "man up" or "grow some balls" - it's primitive, and he should be making cave drawings to show how much a product of evolution he truly is.