A lot of people have already told you that reading slowly just means you don't have enough practice.

Also consider this: you watch a video or listen to a podcast on some subject. If the speaker is a good actor, you are more likely to believe them even if everything they say is bullshit.

Reading (well, after you actually get used to reading) is less of an assault on your sensory inputs so you're more likely to be able to form your own opinion about the subject.

Edit: also try reading fiction as entertainment. A lot of it is much better than the current Hollywood drivel.