OK, these are just some things to do/say to people with if you don't want them to understand you.
-Call them a "Pansycake"
-Call them a "Mudblood"
-Call them a "Mortal"
-Call them a "Muggle"
-Say "Di Immortales" whenever something big happens
-grab some random jewelry, and say "I'm off to save Paris!"
-Say to someone, "I live in the Lost Cities/Panem/(Insert faction) HQ, go to school at Hogwarts, and spend the summer at Camp Half-Blood/Jupiter." I know from experience this confuses the heck out of people.
-Go around wearing an orange/purple shirt, lots of crystal necklaces, earrings/a ring, and a gold pin, showing off temporary tattoos and brandishing sticks at people.