Antiphilosophy is a really tricky word that is used to describe something that is against philosophy, which is just a fancy word for thinking about big questions in a different and deep way. Antiphilosophy goes against this kind of thinking because it believes that it leads to trouble and doesn't solve problems in a good way.
Think about it like this: when you have a problem, like say you lost your favorite toy, you might really want to think about it and try to find it yourself. But sometimes, you might find that thinking too much about this problem can make you feel sad or upset. Antiphilosophy says that thinking too much about big questions just like this can lead to more problems and that we should just do things without thinking too deeply about them. Scientists believe in philosophy, antiphilosophers do not.
But here's the thing, not everyone agrees with antiphilosophy. Some people believe that thinking deeply and trying to understand the world around us is important and helps us learn and grow. So, it's up to you whether you believe in antiphilosophy or not, but it's good to remember that sometimes too much thinking can be a bad thing.