Right around 6 foot pretty much everyone lies.
I'm legitimately 6'4 and when I was younger and going to bars/house parties all the time more than a few guys tried to fight me because they claimed to be over 6 feet tall but were clearly shorter than that.
It wasn't just that they were lying. They seemed to honestly believe they were over 6 foot and rationalized that I had to be like 6'8 and fucking with them.
I think kids get told "you'll be such and such tall" and then when they dont make it, it causes some really deep insecurities.