Okay, mate, what if I linked you a panel where Sasuke is talking to Naruto (about his brother at VotE2) and I told you it was undeniable proof of Naruto dancing and twirling but oh sorry, I forgot to mention, off panel.
That's basically what people are saying here. If the manga doesn't show that he twirled around, he couldn't have made eye contact. When there is a ton of evidence that disproves every argument against the manga fact and the person still argues against it with no evidence, that's when you can call it dumb. Back to my example, you would say "wow, no, that didn't happen, Kishimoto never drew that and nothing supports that as it's not even stated anywhere." What if I respond with: "ok but there's not proof that Naruto didn't break out into a dance number off panel so you're wrong and I'm right."
You would then say that's dumb and you would be right. If someone continues saying dumb things, you don't just let it fly. You speak up. You just want me to end it and say I'm the one dragging it on as if I'm the only one in this conversation. You're the only one not adding to the discussion in any way.