I have experienced strange behaviours of some users, I don't want to name them and I don't even remember. I don't know if it's only engagement bait or if it's their honest opinion. However why do people go into the comment section of some anime episodes and start negative and destructive discussions?

There's no reason given on the negativity, no suggestion on what would be better or questions on why something is in the episode or similar.

Just hate.
Then why click on the episode in the first place? Just save the series in the dropped list and move on, no? That's why there are movie genres. To stick to what you like. Why not leave the taste of others alone, why even shame it or why wish them worse?