Everyone has different tastes and preferences for cars. Some prefer wagons, some prefer coupes, and some prefer sedans. There are cars that give us that "fizzy" feeling Mr. May describes on Top Gear.
Then there are cars that we absolutely loathe. We hate what they stand for, the people that drive them, and what they represent. This doesn't have to be strictly "cars, but can include SUV's and trucks as well.
I personally hate the Caliber (save for the SRT 4). Everytime I see one on the road, I feel bad about the person driving it. There were so many better options than that plastic POS that they could have picked. Yet they picked one that represents one of the worst cars of the era.
So show me what cars make you angry, make you want to throw an egg at their windshield, that you wish never existed.