I agree - I certainly don't give a sh*t about my sounds in a public toilet where nobody knows who I am, I'll never see any of them again, etc. etc. I just let it rip. At home among family as well.
HOWEVER. When I was working (retired now), I had a real phobia about my sounds - and odors - when I saw everyone everyday and I knew people talked. Giggle, gossip, whatever. I didn't like my fear of being noisy but really could not help myself.