In addition, out of sauces ketchup is really the odd one out, most normal sauces and dressings are not supposed to contain sugar at all.

There is a big gap between ‘supposed to’ and the real world. Pick up any bottled dressing at a typical grocery store, and sugar or corn syrup will likely be a top ingredient. See the totally unnecessary addition to ranch dressing, for example:

http://www.kraftrecipes.com/products/kraft-16-fo-dressing-li...

Or even if you are making your own, a surprising number have sugar or honey as ingredients.

https://www.tasteofhome.com/recipes/italian-vinaigrette

Who decides what something is "supposed to" contain? Why is it relevant?

While we're on the subject of questionably-relevant comparisons, remember that bacon contains 500% more vitamin C, and 100% less sugar than Coca Cola.

And coke makes you fat and gives you diabetes while bacon doesn’t. So it is actually an interesting comparison. Well, the sugar part.

How is that reasonably relevant? I can cherry-pick nutritional information to make any absurd comparison I want.

Which is what comparing the sugar content of ketchup and a chocolate chip cookie is. There's less sugar in a cookie than Ketchup, but ~3 times more carbs.

I was agreeing with your point.