It's also possible/likely they're using discrimination. It's cheaper to avoid lawsuits and PR disasters by ensuring they respond faster to minority customers. That and/or Vietnamese customers tend to have higher spend/conversion, so Google gives them better service. Or her husband's Google account had some kind of score based on previous spend/statistical probability that determined he deserved better service.

I think there is zero chance these companies aren't using LLMs to sort out the "desirable" customers from the undesirables. Google in particular knows almost everything about us.