I wouldn't worry about
what the Starbucks and McDonald's etc workers think. I'm sure they've seen much worse, and I'm certain you aren't their only frequent flyer, lol! If it really bothers you then you could try and find a more discrete public bathroom where people are always coming and going. Large office buildings, doctors buildings etc, cafeterias, etc. like iPoop said though, be great fun you're not having accidents!
Pooping diseases suck.