How to deal with non-realism?

From Being a Realist (even if you believe in God):

theists and untheists can and should meet half way and at least agree on the logical necessity of being a realist.

My mother, who doesn’t call herself a theist (I think she’s agnostic), doesn’t even accept realism. She doesn’t even agree with this:

There is something. All that there is, we generally call “reality”. Note that by this definition, reality is unique. The corollary is, we all live in the same reality. We do not percieve it in the same way, but our perceptions and reality itself aren’t the same thing.

Every description of reality that matches it is true. Every description of reality that doesn’t match it is false. In this sense, truth is unique and universal.

(We can nuance the truth/​falsehood dichotomy with probability distributions. Some probability distributions are closer to reality than others, and so on.)

That’s little more than tautologies here. Yet it elicited an impression of being forced to believe. I know because she told me about the totalitarian dangers from such narrow thinking.

I’m happy to have finally found the root cause of our ongoing disagreement, but now, how can I deal with that? It looks pretty hopeless, but just in case, does someone have a suggestion, or should I just leave it at that? (My ego doesn’t like it, but giving up is an option.)

Now I’m relieved to know that in near mode, she’s a complete realist. This craziness only shows up in far mode.