I hate people that wont try new foods. And i hate people that, once you've spent all day in the kitchen making a sunday roast, slather the chicken and potatoes with tomato sauce. What? ITS A SUNDAY ROAST! >=( Copious amounts of salt on food is a bit sickening too.
Also - I knew someone a uni who considered a proper dinner to be plain spagetti in a bowl, a tin of tuna (in the tin, she didnt like foods being mixed) and a bag of kettle chips.