"Why do I make you read things you don't initially like?"

Because if we only read what we liked at the time, we would be stuck in one time, and only ever like one thing. When we are pushed into strange and unfamiliar territory, our brains assimilate or accommodate; look for connections and clicks. This restructures our brain, which then restructures our tastes. Reading what we don't like is not just for educational purposes; it's ultimately in the best interests of pleasure.

This does not mean that we will at some point love everything we initially do not like. But it does mean that the latter has the potential to change what we like and bring us into new territory.

Does this mean that we must love or should love everything that we have the potential to love (through experience of different works)? I do not know. I will be thinking about this.