A "word" of advice from someone with decades of experience writing and public speaking: Don't. This type of line has two problems with respect to making your point.
First, it's not your actual point, so it invites debating the nature of HN rather than debating the ideas you spend the next three paragraphs discussing. And because it comes _before_ your ideas, it is planted in the reader's brain, taking up their attention. You gave it priority!
Second, and more seriously, it can appear to be making excuses for a bad reception before you find out whether you get a bad reception. You may think this will condition people reading your post and its replies to discount any negative sentiment because of the bias you allege, but what it actually does is tell readers that there is social proof for resisting your thinking.
You are literally tilting the playing field against your ideas. I may not agree with everything you say, but I believe your ideas deserve the fairest, most even reception. I recommend avoiding this practice in future.