This will be the 8th, and I have never nursed in a dirty bathroom ... although occasionally I've gone into a section of the library with books that don't interest anyone, and sat on the floor :-).
And any comments I've received, in almost ten years of nursing babies most of the time, have been on the order of "What a cute baby! Is that a Motherwear blouse?" I guess I just live in places with nice people!