“I think ultimately, it is often not good to be able to get As in classes you don’t like because it deadens your senses to why you should study something, i.e., you enjoy learning that area, not to get good grades.”
I don’t think this is the right message, not liking something doesn’t mean you can blow off the class and get whatever grade that you happen to get. And as @bodangles points out, any job will have some things you don’t like, and you have to learn managing through that.