Speaking as a monogamist (or so I think), I had found nothing condescending about your quote, either. As a matter of fact, I had appreciated it precisely because I see that "killer myth" hurting many people. Including some very close to me, I'm sad to say.
Other than that, I don't have much constructive to add here to the rest of your post---it's well-written, and your points invoke a "check... check... check... check." reaction.
(no subject)
Other than that, I don't have much constructive to add here to the rest of your post---it's well-written, and your points invoke a "check... check... check... check." reaction.