Unless they own stock in Ford motors, or work for Ford, it is simply moronic.
Seen on a monster pickup today:
EATING DODGES
(Ford)
SHITTING CHEVYS
I think vehicles started getting good again in the early 90’s and now just about anything is decent (maybe not decent to work on, but decent mechanically and reliability-wise.) It used to be unusual to get 100,000 miles on a car, but now it’s common to get twice that.
Just bought a 100kW natural gas fueled standby generator. The prime mover? A V-10 Ford. 
</hijack>
It fits in with what the consumers have come to expect from experience. The Ford owners have to do a lot of pushing, and the Chevy owners get to drive on a regular basis.
The fighting began when Ford offered no options at first and other makers became the high end dealers. Color and luxury weren’t in the Ford venacular. The word cheap was the selling point for Ford. There started the rivalry, that you see today reduced down to the surviving competitors.
My school age rivalry is from when people could do mantiance and repairs themselves. Ford had some realy irratating problems unique to them alone. Chevy did also. I know that I personaly hated to work on Fords when doing timing and setting the points. The kids I went to school with were influenced by the parents occupation. The farm kids had Ford trucks on the farm, because of the old Henry that they used for wagon pulling. It was a specicific model of tractor that every farm had on it. The farmers bought a lot of Ford. The kids with fathers that didn’t farm bought the Chevys, because they were looking for flashy, and they bought stuff for the looks. My father had a 57 Chevy with the fins. He sold it when I was about 5 years old and got a family car. He regreted that the day he sold it. It was the car he had before being drafted, and dated my mother in.
Heh, cool. See, now you know what it was like for Marathon fans on the PC! 
needs to get back to playing Marathon
So, slight hijack: Are you of the opinion that Pathways Into Darkness, Marathon, and Halo are all in the same continuity? 
Ha! Same with my dad, except it was a '55 Chevy that he traded in on Plymouths.
Just flipped over to Dirty Jobs, the segment apparently filmed in Africa. On the rear window of a truck was: I’d rather push a Landy than drive a Cruiser.
I was just talking about this to my husband, today. You know what you never see? A bumper sticker that reads “I’d rather push a BMW than drive a Mercedes.” I wonder why that is?
My husband drives a Passat – I offered to buy him a bumper sticker that reads “Volkswagon: eating Volvos, shitting BMWs” but he declined the favor.
Those furrin-car drivers – no sense of humor.
I always wonderd at the Ford/Chevy competition from the sidelines. We were an International Travelall family (no, those weren’t ours).
Nobody has ever been able to afford bumper stickers after paying for a BMW. 
And the typical BMW owner wouldn’t want bumper stickers on his vehicle.
My dad was from a GM (specifically, Chevrolet) family. When I asked him why he never bought Fords, he said it was because they rusted out more quickly than other cars, and that General Motors products were generally more dependable than their counterparts. However, his cousin Norm preferred Fords because their performance and styling were (in his opinion) superior to other vehicles. Norm’s father worked as a mechanic at a Chrysler/Plymouth dealership, but Norm didn’t feel he was being disloyal, just practical — after all, if his dad never lacked for work, it obviously suggested that Chrysler products weren’t that mechanically sound!
After years of driving Chevies and then Pontiacs, incidentally, Dad decided to make the switch from sedans to vans, and asked Ralph (a neighbor who’s a mechanic) which makes were best. Ralph said that since Chrysler was the first American manufacturer to commit to passenger vans, the Dodge Caravan and Plymouth Voyager had been manufactured long enough for most of the bugs to have been worked out. So Dad went with a Caravan, and has been happy with the decision.