you live in America? cause here its quite common for a public restroom like say at a gas station or smaller store to only have one stall and a couple of urinals. and the stalls don't provide much privacy against someone whos intentionally being a creep (not that that happens often)
That is why always carry a small 2ft wall to block the area below the stall door so they can't look at my shoes
there is also like a quarter inch gap where the door meets the stall itself to close. thats the part I actually meant. a creep could come up and put his face right to that and stare through. not that it happens often but I could see why it would bother some people.
Once in a single stall bathroom, I saw the half-inch gap covered with a long stream of toilet paper. lol ---