Not really sure how to handle...

Recently, I let my parents know I have a boyfriend. Dad was really supportive. Mom is having major issues. She told me that she would not be comfortable visiting and staying at my place when my boyfriend moves in with me. I quipped that if I was a dating a woman she would have no issues. Then I asked why she would feel uncomfortable. She shut down the conversation: "I don't want negative conversations and feelings so let's not talk about this. So now I can't have a productive conversation with her. Part of me is fed up with her, because of other issues I've had in the past. I've prepared myself to disown my family if they got in the way of my relationships. Any advice?