I truly can't comprehend this.  Imagine a stutterer that explains everything in details a non-stutterer would never be able to comprehend (what non-stutterer knows what a block is?) Having to be questioned that they stutter because they were in an area where they didn't.  I had a video where I stuttered pretty vehemently about a chess game to my cousin where I tried tricks but one stutter led to the next anyway and then a follow up video explain it where I was fine.  I unlisted that video but honestly asking someone else if this person stutters so disturbingly degrading that I don't want to prove anything anymore.  If you know what its like, you can ask me anything that a non-stutterer wouldn't relate to but being judged by someone else online no less on their severity or if they stutter when they weren't a part of my life especially in my younger to college years is something else.  I have stuttered since I was 2 to 3 years old my mother said.  She thinks I was scared by a dog or turning the radio too loud but thats how it went back then, a little too coincidental that it started as I learned to talk.  My real name is not Jimmy, its my nickname I had since I was a kid because I blocked on my real name but eventually I blocked on jimmy too.  Take it for what you will but I don't recommend if someone is fluent, asking others for proof if they stutter.  You should know more than anyone how unique and inconsistent this disability is.