WTF is going on

I'm 20yo and I started watching Sidemen before Sidemen channel, even though English is my second language. These guys were literally part of my childhood. I stopped watching them for a few months, or a year cuz of my uni, I didn't have time, but I caught up with vids now, and I'm watching them constantly again. I don't understand are these fans that are constantly hating on them, are they new fans? Old fans that don't enjoy the content? I mean not all videos can be bangers. I don't recall seeing much hate comments on youtube 2-3 years back. And when i joined reddit, THEN I saw how much hate they have. Just don't watch it if you don't like it. Can someone explain.