Its just you....
It is a fact that some guns are more accurate than others. Some individual guns are more accurate than others. Some models (designs) are more accurate than others. It is a proven fact, deal with it, and get on with your life.
Now, as to two morons arguing which of their service class pistols is more accurate, and waving their guns around while doing it, I admit that would vex me as well.
Accuracy is a combination of things.
Practical accuracy is a combination of those things and more. There are some guns that while accurate in a machine rest, are not accurate in the shooters hands. OR in one shooter's hands, while doing much better in another's. Is that gun accurate, or not? For the fellow who can't shoot it well, its not accurate.
And, general statements about which one brand or model is the most accurate pistol is bull. Once can find very accurate examples, and poorly accurate examples, if one looks enough.
I've got a Colt Govt Model that will put 5 shots in one hole at 25yds (and do it in my hands! -even better!) I've got another that will put 5 shots in 5 inches at the same range, with the same ammo. So is it fair and correct to say the 1911 design is a) extremely accurate, or b) not accurate at all, based on these two guns?
I have a 9mm handgun that I'll bet will shoot a better group than your GLock, Sig, Beretta, Kahr, etc. I'd bet money on it. In fact, I have. And to date, I've never lost. Its a T/C Contender with a 9mm Luger barrel, and if I do my part it shoots one ragged hole at regular handgun ranges. What it doesn't do is shoot a group as rapidly as a service pistol. But it is more accurate than any tilt barrel automatic I have ever run across to date.
I have a scoped XP-100 .221 Fireball that can shoot a smaller group than my T/C 9mm, or nearly anything else. It is quite accurate. But its not a SD/combat gun. And was never meant to be. When someone makes a general statement about handguns, but fails to consider the broad range of what actually is a handgun, it just shows their ignorance.
I don't get mad, or irritated at people who argue their favorite auto is the most accurate handgun. I just consider the source, and their obvious lack of experience and inability to consider everything before spouting off.
"Pistol" includes any and all guns designed to be fired with one hand, or with two but not shouldered. So does the term "handgun". You might consider pointing that out to the braggarts, sometime.