You can win an argument and still be wrong. Volume isn’t evidence.

Winning a disagreement measures performance, not accuracy. Confidence, speed, stamina and a good memory for examples will carry a weak position past a better one, especially in front of an audience, and the other person going quiet is often just them running out of appetite. Persuasive and correct are different talents that occasionally turn up together.

After you win one, check it later when nothing is at stake. Look up the thing you were sure about. Treating your own victories as unverified is how you stop getting better at defending wrong positions.