Yeah, there are quite a lot of these people here. They mostly comment on posts that show up on the trending page, usually without reading them. I got a fair share of comment farmers visiting my posts in the past too and I didn´t pay much attention to them until the day when I wrote a pretty long post about the Plaszow Concentration Camp in Krakow (I know you are from Poland, I´m a Czech but I lived in Krakow for 2 years). I wrote the post with the utmost respect to tragic history of the site, even put all the photos into monochrome etc. And then, these ignorants came again, dropping comments like "wow, cool post bro", "amazing pictures" etc... This is what really triggered me and since then, I have been replying (bitingly enough) to these people so that they know that their behavior is not ok...