Since you brought it up, I will put in my 2 cents, and I will try to articulate it in a constructive way, not meant as an attack at all.
Fair warning, I'm American and I realize you are European, and there are obvious cultural differences that may be at play.
The main problem I have with you is the attitude. Very black-and-white thinking, as if you seemingly just know everything, about everything, which I don't think can be true for anybody really.
I think it makes you actually appear less intelligent, although it is obvious that you are intelligent, but it makes people think things like "pshh what does this guy know, acting like he wrote the book on this subject". But lower intelligence people are masters of black-and-white thinking, and see constructive feedback as criticism, unable to use it to improve themselves, which I don't think you want to be seen as.
Of course, there are people who criticize because they're haters and get a kick out of it. Despite their hatred, their criticism may still be valid.
But most of your comments IMO just seem to be very matter-of-fact, often seemingly blind to important context/nuances that make the answer not really as simple as you make it sound. And when people ask for sources, you often do not respond. I don't think I've ever seen you admit you were wrong either.
In fact this is the biggest problem I have with people in general (not just you), this kind of dogmatism, the black and white thinking. To me it shows a lack of empathy and humility, often those people are also very quick to anger, and I think it shows a lack of critical thinking, as if you somehow have all the answers and are infallible, that there can be no other possible valid perspectives or opinions, I think this is a rampant problem on IRC/the Internet and indeed life in general.
I also notice that a lot of your comments get downvoted, which I assume may be a combination of both unpopular opinions (or that they are stated in a way people disagree with), and just haters that will always downvote certain people.
All that being said, I realize I'm not perfect either, and I have absolutely fallen trap to all these same things and more, and for anyone who I have wronged by it, I apologize.