Unintended consequences lol.
I had a similar experience when I met my girlfriend's dad for the first time (they live out of state). He is a retired Air Force Major and voted for Obama in 08 and Romney in 12. We were visiting for Christmas and the GF had already told him many times about my obsession. He came hard at me the first night, not wanting to make waves and ruin the holiday weekend, I kind of just took it all in and let it roll off my back. The second night he brought it up again. I had enough and started quoting Jefferson and the Bible (in refence to individual sovereignty), and Mr. Republican Robert Taft. By the end of the night, his wife's dad and basically her entire family of medical doctors were on my side. It was awesome.