>Non-Euclidean geometry (geometric axioms in which one postulate is rejected such that the 3 angles of a triangle are not exactly 180 degrees) was considered a meaningless word game and fundamental mistruth.
This is just a lie though. Non-Euclidean geometry is a mathematical model of how distances behave on non-linear spaces. Nobody ever believed it to be a "fundamental mistruth", even suggesting it would look ridiculous. It would be akin to denying linear algebra, even the meaning is unclear.
That the physical reality of space is not linear was a shocking revelation, since all human experience and basically every experiment done up until that point indicated otherwise.
This is a generally known part of the history of mathematics.
> Nobody ever believed it to be a "fundamental mistruth"
https://math.libretexts.org/Courses/College_of_the_Canyons/M...
"Lobachevsky [mathematician contemporary of Gauss, who claimed parallel postulate was unnecessary] was relentlessly criticized, mocked, and rejected by the academic world. His new “imaginary” geometry represented the “shamelessness of false new inventions”"
Further, many claimed premature success in finding logical contridictions in geometry lacking parallel (Euclid's 5th) postulate; which meant they believed a 4-postulate geometry to be fundamentally false.