Based on the information given, it's an irony because while the wife was protesting about the selfishness and injustice in the country, the husband was selfish and uncaring.
A irony simply means a situation where there is a contrast between the expectations and the reality
In this case, the wife was protesting about the selfishness and injustice in the country, the husband was selfish and uncaring. The husband wasn't bothered about the issue of apartheid.
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