"I can only think that what happened was a combination of racism, incompetence and stupidity."
"For sure the teller was Thai Chinese."
"Mister you tomollow go to own Kbank branch" in pijin English like a complete retard"
"if no one points ever points out her mistakes and her colleagues at the branch seemed as clueless as she was"
Doesn't look like nothing to me.
He hasn't explained his role in the company yet, so there isn't any clarification that she is wrong to start with.