Young kids are extremely receptive to self-fullfilling prophecies, and very flexible. If they hate school, it's better to find out why and try to see if you can get them to like school. You can kinda trick them by trying to associate school with fun, talk about how much you enjoyed school as a kid, and try to get them to talk about things they did that they liked at school. Or the flip side is maybe you'll learn that there's something serious you need to help handle as a parent