Okay kiddo, so you know how you have different types of toys and games at home? Well, grown-ups also have different types of computers they use. One type is called "desktop Linux", which is like a special kind of computer system that people can use instead of other types, like Windows or macOS.
But some people don't like desktop Linux and they criticize it. Why? Well, some of them say that it's too hard to use because you have to do things like type in special codes and commands instead of just clicking on icons like you do on other systems. It's like playing a game with all these rules that you don't know yet.
Other people say that desktop Linux doesn't have as many of the cool apps and programs that you can find on other systems, because the people who make those apps don't always make them work with Linux. It's like having a toy that doesn't come with all the accessories you want for it.
Finally, some people say that desktop Linux can be less secure than other systems, which means that it's easier for bad guys to try and break into your computer and steal your stuff. It's like having a toy that someone else can take away from you if you're not careful.
So, some people criticize desktop Linux because they think it's too hard to use, doesn't have enough cool stuff, or can be less safe than other systems. But just like with toys, different people like different things and it's okay if desktop Linux isn't your favorite.