The perception of masturbation can vary significantly.
Many conservative communities consider masturbation unhealthy and sinful. Female masturbation is especially frowned upon. This isn't just in India. It happens around the world. Some evangelical baptist communities in the USA are so conservative that they even call tampons as satan's cotton fingers. Google it. So if the husband belonged to a conservative family, naturally he would be appalled at masturbation.
Ego is another factor that molds attitudes towards masturbation. Many folks believe that people in relationships need not masturbate. The partner should be the one to satisfy all sexual needs. They take it as a personal insult if the partner chooses to masturbate. So he could have taken it as an insult to his sexual performance. Some people take sexual performance seriously and it is a not so uncommon reason for divorce.
Masturbation is just something natural people do. It has no reflection on the partner's performance or ability to satisfy. People who have great sex and intimacy also masturbate. And sometimes even people in committed relationships fantasize about other people. If not voluntarily in porn, they can get wet dreams. People in relationships just need to talk to each other about what their expectations and boundaries are, and have an open mind.
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