That's funny. Except that it actually happens with some South Koreans.
Talk to a few Korean women who have married American soldiers who brought them back home when their enlistment ended, instead of spending 20-plus years in uniform. The ones who marry an American and spend years in the military learn generic English. Not so if they move to the Deep South shortly after marriage.
Hearing a native Korean tongue saying "ya'll" and "grits" (remember the trouble Koreans have with 'r' sounds) can be funny.