Ok kiddo, so some people have come up with a different way of doing math called nonstandard analysis. It's kind of like a new math language. But not everyone thinks it's a good idea.
When people criticize nonstandard analysis, they are saying that it's not a good way to do math. They might say that it's too complicated or that it doesn't make sense.
Some people think that nonstandard analysis is kind of like making up your own rules for how to do math. It's not like following the rules that everyone else is using. And when you make up your own rules, sometimes things can get really confusing.
Other people might not like nonstandard analysis because they think it's not really necessary. They think that the regular way of doing math that we've been using for a long time is just fine.
Overall, people have different opinions about nonstandard analysis, and it's okay to have different opinions. But what's important is that everyone tries their best to understand and use math in the best way possible.