Well, my wife would argue with you on the pineapple on pizza, she loves it. When we go out for pizza we'll order half with pineapple and ham, the other half gets sausage, pepperoni, ground beef, onions, green pepper, and extra cheese.
Ketchup has it's place, I like the ketchup/brown sugar glaze on meatloaf, I like it on french fries and other stuff at times and use it in recipes for certain blander foods to give the food a bit more zip. Why people are so snobbish about it really makes no sense to me. Eat what you like, no need to be rude or make fun of other peoples tastes, I'm sure you eat things that they may gag over but most won't condemn you for liking it.
I love fish and other seafood but I just don't care for oysters, salmon, or anchovies no matter how they are fixed (and I have tried them fixed a great number of different ways), it's just my taste buds I guess. But I do love calamari and octopus. Does that make me a bad person?