Sounds like your parents are insecure due to their business failings (and possibly due to weight - both of them).
Sounds like your husband is rude - dominating a conversation and having little interest in other reflects poorly on yur husband. It is far better to be interested than interesting. His dismissal of them based on business etc is nonsense - he can stil respect them as people and listen totheir opinion even if he doesn't agree.
Sounds like you are trying to "keep the peace" instead of making things right. They are your parents, your husband should respect that and handle them accordingly. On the other hand, he is your husband and you love him - that's fine - but don't confuse it. If he is disrespecting them they have every right to be upset. Doesn't say much about him that he treats them that way, nor about you that you allow it.
Ive read through your comment a few times.
Its really a difficult one because as nice as it would be for my husband to just pretend like everything is fine, everything is not fine.
My parents were very controlling of me growing up, and I started dating my husband when we were still in high school so there is a lot of history. Theres a lot of stuff that we have been through with my parents.
Maybe Ive made my husband sound like he is rude to my parents. He is definitly not rude. He just does not entertain my mom when she goes off on a tangent about what to stop eating, or when my father tells us he wants to test drive some car hes looking at buying when we know that is not possible.
Theres all sorts of complicated bits in the middle too, like my father in law is good friends with my moms childhood friend who can not stand her today. My mom knows this and is absolutely paranoid and thinks my gather in law and this man are conspiring against her. So whenever he is brought up we both quickly shut it down.
I will talk to my husband again about our values and the value we have in family. I will see where we are at in terms of that the next time we see my parents, but I have no control over my husband and nor do I wish to control him. So I dont let him do anything.
My parents have to a large extent ruined their lives in a financial sense because they are to proud to admit and accept their business has failed. Time and time again they pass up opportunities that have come their way to walk away and just retire and live simply. My dad gets a pension of 11k a month as he was employed previously.
Its not much but they could actually live and retire if they really wanted to. But it would mean swallowing their pride and down sizing their lives a bit in terms of what they are renting now etc.