About Social linguistic failure...

Good morning, good afternoon, and good evening!

It is suddenly getting much colder in Korea.

Especially, the flu is so rampant. Take care of your health.

I'd like to ask you what a social linguistic failure is.

From the book i read, the example of it is follows:

Native teacher: Wow, you have a good pronunciation!

Student: ...

and i also want to know "pragma linguistic failure"

(i guess 'pragma' might mean 'pragmatic')

The example of it is follows:

Native Teacher: Would you like some more?

Student: No, i would not.

would you please explain what they are and mean?

and if you can, please give me more examples and compare each other.

and if you know more about them and are not bothered,

let me learn about socio-pragma linguistic failure with examples

Thank you in advance!