At http://humanknowledge.net I define "fact" as "a synthetic proposition
that is demonstrably true", and I define "subjectivity" as "dependency
on a point of view or perspective that is inherently private". So to me
a subjective fact is one whose demonstration depends on somebody's
inherently private point of view or perspective.
It's a subjective fact that the author of this sentence thinks it's
amusing that Mr. Sipos chose to quibble about my use of the phrase
"objective fact". :-)