Why do people hate dynamic queue ?

Because it's not fair for solo queuers.

The same reason people like Dynamic Queue. Advantages over others.

Premades - Get to stomp on Solo Queue players on a daily basis and get them banned.

Solo Queue Players - Get to ruin Premade players games by dying once, getting reported by the premade, and getting banned, thus they don't have to play this unbalanced garbage anymore :D. Everybody wins.

I hate it because i am being forced to play it. Every single game i go solo in ranked i lose. That it not a joke. I get feeders and trolls. Yea i am not a perfect player, but when every single solo game has the same outcome i really start to wonder why i even go solo. If i dont go duo or trio i get trolls, almost like i get worse win rate teammates. Maybe a conspiracy, but no joke every solo game ends from feeders and trolls building troll things. What a good way to force you to like the dynamic q right? Make players who go solo get matched with people who have low winrates, making them want to only play with friends because losing over and over solo gets pathetic.