Info on the bigot Nick Adams: https://en.wikipedia.org/wiki/Nick_Adams_(commentator)
Relevant part:
Adams opposes education regarding LGBTQ topics in schools and said that only a "bad parent" would take their children to see a drag queen show.[18] LGBTQ Nation, an online news magazine, has alleged Adam's apparent hypocrisy on this topic as he has suggested taking children to Hooters.[18]
I don't know if this was to point out that a file is iron and that can sharpen stuff, but I'd like to point out that files are generally made from a tool steel alloy that is formulated to be quite a bit harder than iron/standard steels after it gets properly heat treated. Files aren't just "iron" and there's a lot of different steels that do different things.
Exclusively iron files are a thing, they just didn't make for as good a screencap, cuz they look like pressed turds. The point was only that stone isn't the only option for grinding. An iron file used on some other iron surface would smooth out the scaling on the file pretty quick; but it'd also do a bit of actual grinding on that surface as well.
So, it'd take a lot of grinding, most likely with many file, but you could 100% sharpen an iron edge with an iron file. ...and tbh, lots of grinding with many tools fits the theme the thread perfectly!