Let me first clarify that I think you seem very nice and I'm not mad at you, nor do I have any intent to make you feel bad. I think you're misreading my tone, tbh. That or I'm expressing my tone poorly.

So, I thought I did correct you politely, within the bounds of also needing to make very clear and unambiguous that you needed to adjust your confidence when talking about this subject. I have no issue with someone idly brainstorming ideas, but in the context of your original comment "There are so many ways to do human verification that have worked for years.", which you didn't qualify in any way, you sounded completely authoritative and sure of yourself. Since you yourself even know that you are ignorant on this topic, to me a better phrasing would be to preface that with something like "I think..." Or "It seems like...", or even outright saying "I don't really know about this stuff, but..." Etc.