I don't like people according less respect to others because of how they learned to speak.
Not being able to understand someone's very strong accent is not disrespectful FGS.
Everyone has an accent. Not just Glaswegians and Indians. It's not the accent that is problematic, it's your husband's inability to understand it.
You don't get it do you? Loads of posters have posted that they have difficulty understanding people whose accent they aren't attuned to. Why do you find that so difficult to understand? It has nothing to do with "not making an effort" or being disrespectful 
Is everyone else on here who struggles with unfamiliar accents rude and disrespectful?
Can you really understand all very heavily accented English over PA systems in a noisy environment. You are being extremely obtuse - again.
I expect you'd say my lower middle-class Home Counties English accent is less heavily accented than a Mumbai English or Gorbals English accent, but it isn't. It's all a question of perspective.
I have the same accent as you. Any accent that different from your own, regardless of where you come from will be considered an accent. A Glaswegian will say that I have a strong London accent.
I love hearing different dialects BTW.