Why are natural bodily functions "gross", "disgusting", "disrespectful"? Your body (yes, even YOUR body) makes gas as a bi-product of digestion, and it has to be released for our health.
As long as he is not doing it in public, then I agree with the others suggesting that this is a sign of his level of intimacy and comfort at home - you make him feel safe enough to not have to pretend to be someone he is not. This is respect for you in the highest degree. It might help a little to see it as such.
That being said, feelings are feelings (there is no right and wrong) and deserve to be heard. Try having an open and honest conversation with him about how it makes you feel when he does this. Then, just as openly and honestly, hear his response back about how he feels. When both of you feel truly heard by the other, then maybe you can both shift perspective a little to meet somewhere for a compromise.
While I personally don't find flatulence disgusting, I do find threatening for divorce over it horrid and reprehensible.
And yes, my husband also passes gas frequently and loudly (from his top and bottom) at home. As do I. And we BOTH laugh out loud whenever we do.
I wish you good luck, however you decide to handle it.