Human: What did Dave Sim write in his letter? Assistant: 
In his letter, Sim wrote that he was "the lowest, subhuman form of life in our society with impunity. "Sim's letter ended with an ultimatum, requesting that those who wished to receive his return correspondence reply with a letter or online posting and the statement, "I do not believe Dave Sim is a misogynist. "All others were asked not to attempt to contact him again.