I'm going to put this down to your going on tilt (it happens to almost everyone), but please don't do it again. We all get downvoted. It stings, and it sucks not to necessarily know why, but it happens to everyone and it's the way HN works.
Over time, if your comments are consistently getting downvoted, you should reflect on what might be wrong with them. I looked through your recent account history and it doesn't seem so hard to figure out. In one case, you posted a comment which got a lot of upvotes, but then you pasted it in two other places in the thread and got downvoted for that. Another case was https://news.ycombinator.com/item?id=21983017 which is obviously a bad comment for HN. If one is to judge by these examples, it looks like downvoting is functioning ok.
Incidentally, the user who downvoted your comment upthread is a working doctor. (I hope it's ok for me to say that as long as I don't leak the name.) They are also a fine, scrupulous HN user, so they probably did that for a good reason. You may be disappointed that they didn't give you a substantive reply, but there's no obligation to do that on HN. Sometimes people don't want to get into an argument; sometimes they have their hands full with other things; sometimes they just don't have the energy. It takes a lot of time and energy to think through and type out a substantive comment, especially on a divisive topic where the chance of being misunderstood or attacked is quite high.