A family argument over a wedding dress and some vying for the spotlight between the daughter-in-law and the mother-in-law, which is normal in families, is not the occasion for a public rant against your own parents.
I'm amazed you think it is just that.
I remember when V&D first met, and they were pimping out their firstborn shamelessly. I remember thinking FFS, this is ridiculous. Then child after child the same.
I think his post was particularly hurtful, we don't know the whole story, but I have said for decades now, V&D should not be exposing their kids like this for clicks, money, PR. I'm not surprised he has hit out. You reap what you sow.
They have always been fabulously rich, as a PP said, they could have done all this without creating 'Brand Beckham' but it was the pursuit of just more and more they couldn't resist, and they had passive little people to enrich that - their children.