The English have no taste (buds)

I'm getting used to the fact that the guys I work with are not the most cultured people (see my 'Boys are Dumb' post). Their eating habits (bar one) leave a lot to be desired. Pies, chips and 'bacon sarnies' are the go. So is any type of sugary fizzy drink and whatever is on offer on the office vending machine. Fruit and veg is a bit of an unknown for them. The one guy who is on a diet seems to only eat cheese and drink hot chocolate. This has something to do with 'not eating carbs' rather than eating healthy...
But despite all of this I did not expect the same from my flatmates. They seemed to be a bit more sophisticated, actually eating vegies instead of believing them to be some form of foreign food. How wrong was I.
I had decided that since all four of us were going to be home one night that I would make pizzas (from scratch) . I had picked up a really good recipe for the base watching Jamie Oliver one night, and previous attempts had been very successful. So I spent my lunch break that day in the markets near where I work. I managed to find some decent vine-ripened tomatoes (quite a feat in England) for the pizza sauce. Got some decent cheese, mozzarella and a good fetta. I got various other toppings, including baby spinach (a good combo with the fetta). When I got home that night I got to work. I kneaded dough, made sauce and chopped vegies. My flatmates, to their credit, helped where the could, even making cocktails to 'aid' the cooking process. I put the pizzas in the oven and it was not long until we had the perfect pizzas. The cheese melted nicely, the garlic was strong, and the toppings were a perfect mix. Everyone complimented me on my efforts, and we sat down to eat and drink.
Then, to my horror, one of my flatmates got up to get....KETCHUP. To put on MY pizzas! The next thing I knew all three had the ketchup on their plates, dipping slices of pizzas as though they were some sort of dodgy party pies. Despite my groans of disbelief, they continued with their ketchup orgy and I vowed never to go to such lengths for them again.
Still, after four more of the cocktails, I could almost forgive them.