I've heard that it's common for people to randomly quiz homeschooled kids to see what they know. I'm talking about like at family gatherings, asking them if they know Presidents or addition facts, etc
Um, most people don't do this to public schooled kids.
Do you have an automatic comeback?
DH & I already have plans, we'll fight back and ask them to speak French (DH only speaks French to the kids, so they are pretty much guaranteed to know more than the peson asking as well as that person's kids in French).