Burger King and Fox join forces to crack fat jokes about Jessica Simpson — classy

Here’s another one of those head-slapping marketing moves. “Fox NFL Sunday” aired an animated skit, in which players from the Dallas Cowboys make fun of quarterback Tony Romo, mostly by cracking fat jokes about his former girlfriend, Jessica Simpson. Very classy. Burger King told Advertising Age ’s Emily Bryson York and Jeremy Mullman that it didn’t create the ad — Fox did — the fast food chain just sponsored the spot. “Weight jokes associated with a fast-f…