Vietnamese boys have a good personality.

I think this question is a false proposition. Men in any country have good personalities and bad personalities, so we can't generalize.

The tradition in Vietnam is that women work, while most men don't, so it is impossible to say that men have good personalities in such a patriarchal country.

In fact, Vietnamese men are overbearing and arrogant, and their character is very violent.

Of course, there are men with good personalities in Vietnam, but that is a minority and cannot represent all Vietnamese men.