They hate because they care, because they still play, the game have been out for 10 years, EA talks about how many people that are playing the sims4 but how many people are leaving because they are frustrated? Or take long breaks because they get tired or annoyed? Some might try to come back but don't feel the same joy as before because of limitations or because they want something new. And when packs uses the same framework as the same packs that they sold 8 years ago, patience runs out for people.
Some things in the game can be really frustrating to deal with, especially if you don't have mods, that makes people lose patience. Right now I can't play in San Myshuno because the market is bugged and is overflowing with objects, things like that makes people angry. I sure am not happy because of it because City Living was my favorite pack and now it's broken.
For a lot of people the sims4 is escapism, and if that escapism doesn't work that is frustrating and makes people feel worse.
Additions to the game since it became free to play have made people frustrated, they have paid for the packs but still see ads for packs that they own, or an ad for a pack that they don't own every time they start the game, of course they will be frustrated.
Because the game have been going for over 10 years, if you are using a low-spec computer you can easily end up with too much so you start seeing issues, go to the technical issues forums and answer hq, loads of people are unable to play, that makes people frustrated.
They are frustrated because of the decisions that have been made regarding the sims.
If more development had been going into this franchise, things like this could maybe have been avoided.