MorahRach, your latest post contains the answer: You are the only religious ones. That should give you perspective!
You don’t say if your in-laws are religious or not. If they are not, they very obviously aren’t “more proud” of your husband for being frum. They probably feel threatened by it, feel that their lifestyle was rejected, and that you think you are better than them. They probably reacted so strongly to a request for money because it fed into a deep-seated fear that maybe you look down on them and only appreciate their money. It also would fit very well into any stereotypes about religious Jews and money.
This is their way to express their disapproval, and YOUR chance to demonstrate that you love them for who they are, the way they are, and it has nothing to do with them financing your lifestyle (which they might respect on some level, but disapprove of on many more levels).
They probably feel like “he made his bed, let him sleep in it.”
May I suggest learning “Chovos Halevavos, Shaar Habitachon”? Trust that Hashem will give you whatever you need. If you respect the Lubavitcher Rebbe, this book will also be an eye-opener. Remember, your husband may have a rich father, but we ALL have a VERY rich Father.