"Trust your intuitions, but don't waste too much time arguing for them"
This is an excellent point. Intuition plays an absolutely crucial point in human thought, but there's no point in debating an opinion that (by definition, even) you're incapable of verbalizing your reasons for. Let me suggest another maxim:
Intuitions tell you where to look, not what you'll find.




What do you think you're adding to the discussion by trotting out this sort of pedantic literalism?
Unless someone explicitly says they know something with absolute 100% mathematical certainty, why don't you just use your common sense and figure that when they say they "know" something, they mean they assign it a very high probability, and believe they have epistemologically sound reasons for doing so.