I could see your first comment getting downvoted, since it was short, negative, and incorrect.
Your next comment (and this one), no. You're absolutely right that you shouldn't have been downvoted. You're still arguing against a whole lot of existence disproof, but you make your point well and offer some constructive commentary and alternative ideas.
Stick around. You're providing more value here than whoever it was that went off on you with the downvote button.