Not defending the language the person used, but I think for many it comes down to not being the target reading type despite perhaps being the target age group.

Some people REALLY like the "wattpad" writing style, or an extremely easy to follow low thought level book (if that's what you're describing as "lazy"). Others want more intensive thought provoking books and complicated stories that make them think and work, which I find sometimes lead to books being called lazy by those people when it's targeted for the less intensive type reader.

Objectively, books can be bad as a whole, but I think it majorly comes down to the type of reader- as you said, you dislike Hoover, while her popularity is high with others. So it's an obvious preference thing.

No answer to this question (being called a snob), as I also don't have any books off the top of my head i find "lazy", but did want to share my thoughts on the matter.