First, in the first case, I don't think manager Wang's approach is appropriate. At home, people at the same level should receive their peers. What's more, the other party has an appointment. Even if the other party is disrespectful for special reasons, it should not make any disrespectful behavior towards visitors.
Second, in the second case, I personally think that the wife's approach is a bit silly. If I were you and heard my husband, I would ask for something other than a diamond ring. It doesn't hurt at all. Express your love for your husband.