A: So the good news, is that all the "guy" stuff your husband does in your presence speaks to his degree of closeness and intimacy that he shares with you. He is so comfortable with you that he feels totally safe to "be himself" and not have to hide all his bodily functions and "personal" behaviors that people tend to do discreetly or in private because they are so unappealing and unattractive.
The bad news is that these habits tend to be "disgusting" to many people and hence considered socially "rude" to do in the open . So while your husband is feeling hunky dory just "doing his thing", it's understandable that you are experiencing it as thoughtless and inconsiderate on his part since this isn't acceptable public behavior.
My suggestion is that you talk with him and acknowledge the fact that you're glad he feels so free with you to just "let go" whenever he feels like it ( whatever that may be) , but that for you it actually feels inconsiderate and that your presence isn't important to him and doesn't matter since he is not taking the time to show you the same degree of respect and consideration that he would afford strangers.
Suggest some options that would work for you and make you feel better, such as asking him to say 'excuse me', or cover his mouth when he burps, or leave the room if possible if he's going to fart, so that you feel less disgusted and more considered. Of course, you need to do the same for him!
He may not do it all the time but at least if you feel he's thinking of you, it will go a long way!!