I kinda took the "bawoosh in the toilet or bawoosh all over your floor" as a threat as well.
I mean, how is the clerk supposed to respond to that?
And is it really fair to the employee that his/her options are either (1) break the rules he's been given & allow your child to use the restroom or (2) clean up the mess your kid makes?
I get it. Emergencies happen.
But does your emergency make you any more entitled than any other person? And what constitutes an emergency? At what age should a child be able to "hold it"? Who determines that? How many times should a clerk make the store's private restroom available? What if there were 5 other kids in the store, &, when they see one child going to the restroom, they suddenly all decide they need to go too? (I've been a kindergarten teacher...)
Instead of arguing w/ the clerk, I'd be scooping my kid up & finding the nearest restroom.
Again, I think it's fine to ask, but, once you're told "no, I'm sorry," that should be the end of it really.
I'd be ticked if, as a shop owner, after I told you "No, I'm sorry, but we don't have a public restroom here," you proceeded to let your child go all over the floor.
(And if you threw cleaning supplies at me, I'd be tempted to call security.)
And I realize that little children who are just learning really do sometimes suddenly have to go & "go right now!" But I'm seriously trying to think of a place we've been that I wasn't able to get my child to some nearby public restroom. Maybe the post office? (Which is kinda funny since the OP is about a postal carrier... LOL!) But I also always drove around w/ a potty chair in my van, so I could have run out to the van w/ whichever child if necessary.
Why can't we as parents take responsibility for our own children?
My kids are 15, 13, & 5... no pee accidents in the middle of a store yet. I was constantly saying things like, "Here's a bathroom. Does anyone need to go? Why don't you try while we're here?" "We're about to get in line, so why don't we stop at this restroom first?" "I don't think such & such store has a bathroom, so you need to go to the bathroom now."
As an aside, once, when I was at the mall by myself w/ DD & older DS when they were about 5 & 3, DS suddenly announced, "I feel sick, Mommy" - no symptoms or any sign of sickness until that very moment. He threw up, & I proceeded to "catch" it w/ my hands & in his shirt.