Interestingly, someone commented such behavior existed in Japan not so long ago.

Quote:

When I first arrived in Japan a few decades ago, a gentleman introduced his wife as "gusai." (I have a stupid wife.) In fact, she had a doctorate in nuclear physics. This practice of selling your wife short was considered polite but this cultural phenomena has grown out of fashion.

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https://medium.com/@gcampbell_23488

(whose stories about Japan I recommend :)