Because ketchup is not a “classy food/very weekdayish” and they dont want that for their precious child.It doesn’t fit with their ideal/their shpitz of a Shabbos meal!
Now *that* has to be one of the stupidest things I ever heard.
I guess my kids are never going to get a shidduch. We sometimes have *gasp* spaghetti and meatballs for Shabbos. 🙂
The Wolf