A person should understand that no language(programming or otherwise) is perfect. Therefore there is some criticism of any language that is valid. Therefore some criticism should be taken seriously as there may be a real point to the criticism.
There are many posts like this, where there are comparisons of Rust to C. Realistically they are all a little biased towards Rust as Rust is a C++ replacement really. A more proper comparison would be Zig or D as a better C against C.
Just understand that a person defending C is not always an idiot, and maybe they have point. Consider the excessive memory use of any working Rust compiler. That will probably not be remedied anytime soon and is a legitimate complaint. The ideal of how something could be is not how something is. The reality is that C works pretty well most of the time, Rust works well most of the time. They both fail at some things.