Why do Guangxi people speak nonstandard Mandarin?

No, let's hear your standards. People in other places, accustomed to the local dialect, think that Mandarin in Guangxi has a local accent and is not up to standard. However, people from the Northeast also have a Northeast accent, and people from Taiwan Province Province also have a Taiwan Province accent. What is a standard? The official definition of Putonghua is: Beijing pronunciation is the standard, northern dialect is the basic dialect, and typical modern vernacular works are grammatical norms. However, people in Guangxi may not sound standard. When it comes to standards, most broadcasters are very standard. Personally, I think Nanpu is also quite good, hehe.