"I have a dream that my four little children will one day live in a nation where they will not be judged by the color of their skin but by the content of their character."
I have a friend, lets call her J. J is white. A few years ago, J married a man who is from India, and is Indian. Her parents did not approve. They didn't come to the wedding, and for a few years were not on speaking terms with J. Not because of the content of her husbands character, but because of the color of his skin.
We have a term for this view. It's called "racism"
Now, leaving behind any emotions about destroying the jewish people, etc. How is her situation any different than mine? My parents, and all the various asshats who don't 'approve' of me marrying B, are not judging our relationship on the basis of his character. They are judging him based on who he happened to be born to. Who his parents are.
You can argue about whether Judaism is a race or not. That's not my point. My point is that if you believe racism is wrong, then how can you think disapproving of my choice of partner on the basis of who his parents are is right? How can disapproval of racism be reconciled with a disapproval of me marrying B? Or should I just assume that anyone who disapproves of our relationship thinks that racism is just fine and dandy?