I really don't understand why Khander Rao is so crazy about getting appreciation. He is shown as such an egoistic and jealous person who can't appreciate his wife for once. And this is mainly due to his mother's overpampering attitude towards him and her always belittling Ahilya and trying to project her as some sort of evil person in front of her son. The main reason lies in his worst upbringing by his mother. I don't know how much its historically true, but I don't care as long as Ahilya Bai's achievements are not belittled in the show.
Talking about Khander Rao, if his self-esteem is so low, why he is not working on it. He minds about his wife proving greater than him but he never worked on making himself better for his wife. Always he goes on complaining to his mother about his wife and his mother shuts her up and gave her punishments. And if Ahilya (who didn't in real) complained about him to his father, then she is wrong!! That's because only she is a girl and he is a boy. What a logic!! Girls are expected to behave as an ideal sacrificing wife for his husband even if he is wrong. That's why our society still not evolved much, and majority women are treated just like that directly or indirectly in all classes where they are not being allowed to reach higher in career compared to their husbands.