David Simon, head of the nation’s largest mall owner, doesn’t like the taste of rejection — especially when it comes from a rival struggling to get out of bankruptcy.

After seeing its $10 billion offer for Chicago-based General Growth Properties rebuffed, the CEO of Simon Property Group yesterday took a more aggressive tone. He fired off a harshly-worded letter to General Growth CEO Adam Metz, urging him to accept the merger offer Simon submitted last week.