For example: I don’t believe in the axiom of choice nor in the continuum hypothesis.
Not stuff like “math is useless” or “people hate math because it’s not well taught”, those are opinions about math.
I’ll start: exponentiation should be left-associative, which means a^b should mean b×b×…×b } a times.
Most real-world phenomena would be better represented as regular Directed Graphs than Directed Acyclic Graphs, even ones that are traditionally abstracted as DAGs.