Reading in any form is going to be more conducive to critical thinking than consuming media via the internet, social media, etc. Even if you read Colleen Hoover, you're reading. This is far more engaging than staring at a screen.

It's definitely true when it comes to writing there are different levels of skill, and while Hoover might not be a particularly strong writer when it comes to prose or intricate plots, it doesn't devalue the act of reading itself. A lot of people like to flaunt the classics as if having read them is evidence of their superior intellect, but the truth is to appreciate books like Fahrenheit 451, you have to have read around enough to know what makes Fahrenheit exceptional in the first place.

I don't think people who love Hoover are wrong for their opinion. Personally, I love Janet Evanovich's Stephanie Plum novels, and I've even read Twilight and ACOTAR and liked them. Are they strong examples of well written books? No, but they're entertaining, and because I've read them, I further appreciate every book I read that has stronger prose and solid character development.

I don't think people are superior for having read the classics. I think they're classics for a reason, and worth reading in their own right. But having read them doesn't imbue you with some sort of higher knowledge or prowess in reading. Classics alone don't make you think, and you can read just about anything—even something by Colleen Hoover—and come away with a meaningful interpretation.

If you want to get better at your own critical thinking, spend more time thinking about what you read. Pause after every chapter and ask yourself what the chapter revealed about each character. How did this chapter work to move the story forward? What do you think this is building up to? If you're interested in the writing style itself, reflect on things like the sentence length, the amount of description versus action that takes place in the chapter. Thinking about these things will help you not only figure out what you admire about the books you read, but it will also help you further develop your critical thinking skills in regards to reading.