You are good at reading so it is passive. Someone who doesn't read much is not good at it, and so no reading is passive. Get that person to read some more and eventually they get good and it can become passive, but for most it is not.

I could watch TV passively (I don't watch TV, but I could). However if you switched my TV for one that received only Spanish - I have enough Spanish that I could understand, but it wouldn't be passive for me, it would be hard work to understand.

> I read while lying on the couch, my head resting on a pillow. Is that not passive enough?

Obviously I meant mentally passive, not physically passive.