Interestingly, misandry is not listed in the Merriam-Webster dictionary - online or in the Collegiate Tenth Edition. Someone showed me a letter they wrote the editor about this, and apparently misandry is in the unabridged version, but they do not believe it is in common enough use to warrant inclusion in other editions. However, I don't think it is a very obscure concept, certainly you don't have to go much further than the break room at the office to run into some misandry ('oh well of course he wanted to watch football, girlfriend, he's a man!').

This is pure speculation, but this sure seems like another case of political correctness determining what words we can use. In mixed company misandry is acceptable while misogyny usually makes you look like a male chauvinist. I'm just saying the aforementioned football comment wouldn't raise an eyebrow, but if I said 'well of course she can cook, she's a chick!' in the same crowd I could probably be sued for sexual harassment.