I have hated ketchup since I was a kid. Most of my extended family is the same way. If I want something "ketchup-y" on a burger or hot dog, I will use barbecue sauce. Gochujang is also good if I'm more in the mood for spicy-sweet.
I do like mayo, but I lean more toward mustards.
The only thing I eat ketchup in is curry-wurst. (At first I made it all from fresh ingredients, but then found using ketchup as the base still tastes good and is so much easier)