Not ready to potty train yet, but yeah, I'm another adult who won't poop in public unless it's an absolute emergency. I have been known to drive like a maniac to get home to do so in a hurry (no, not with the baby in the car for anyone wondering).
I have the opposite issue. Sitting in the pediatrician's office and DS starts grunting and pushing and his eyes start watering. Then the beautiful poop noises. And then he looks at me, squeals, and claps.
I could have died. He loves making poos in public.