Yeah, it sucks. I've found that the most intelligent and decent of folk sometimes have a hard time making the translation from one gender to another when dealing with someone who has transitioned. Their mind has been trained to think of you one way and it's hard to make the leap in the other direction. I try to have patience with well-meaning people even if they are clueless. It's not easy, and I imagine having to live with someone who doesn't readily get it could be maddening. Good luck, and try to have patience. It sounds like he's not being malevolent, just clueless. He'll get it in time, hopefully, and when he does it will be better for you if you took a more gentle approach along the way.