If you think the Earth is spherical and rotates on its axis, but you do not know or understand the evidence supporting that (beyond what folks around you tell you), yet you scream at Flat Earthers for their ignorance of science, you're not defending science.
That earned me a block. But really, unless you dig into the evidence, the Flat Earthers at least have some obvious evidence supporting their position. Naive maybe, but real. So every year I ask my students--how do you know that the Earth is round and that it spins, beyond some (cult)ural beliefs?
Alas, it backfires a bit, at least temporarily--kids truly start to question the Earth's shape. That's OK, *more* than OK. We can cultivate skepticism without creating more conspiracy theories. Foucault's pendulum is a wonderfully just-complex-enough demo to tilt the argument hard the other way.