If anyone is in on the joke, it’s Richard Marx. Grammy Award winner, hot producer-songwriter and all-around good guy, the Chicago native knows why some people don’t like him. “Nobody gets the joke more than me,” says Marx, who resides on the North Shore with his wife, dancer-actress-singer Cynthia Rhodes, and their three boys. “When I first started out, I had credibility because my songs were played on rock radio and Joe Walsh was playing guitar on it. Then within a year, I became the anti-Christ.”