Rude questions

I knew going into the service dog process that we would get rude comments. Heck, most of Mika's life I've heard "But she looks so normal!", and that's definitely not a compliment. I even wrote Dear Abby about what to say. And she actually answered me! I feel so famous. :-)
Anyways, Abby didn't object to my politely telling strangers to mind their own business. And yes, I'm trying to be polite and, boy is it hard. I asked her what to say to acquaintances when they asked. They are people I can't be rude to, but I'm not comfortable giving information to. She told me to say "Oh, I don't want to bore you with the details" and then change the subject. It's good advice but I'm not good at coming up with new subjects off the top of my head when there's not much shared background. I need to come up with a good go-to topic. I'm always happy to default to baseball. Some people love it and will be happy to talk. Some people hate it and will do almost everything to avoid it. It seems like a good option now that I think about it. I'll have to try it and see how it goes.