I have issue with some of them.
It is certainly someone's business if someone makes a play for their wife/husband. and parents don't parent in a vacuum: so if your parenting choice means your (general you) kid is harming me, my family, my animals or my stuff... I get to say something. If your kids is preventing me from seeing/doing/enjoying stuff because "adults need to stand back and let kids do XYZ and you can't because you're too old" - sorry, I am saying something...ect. But as long as your kid is being age appropriately reasonably behaved - yup your choices should not be questioned.
Yup until you keep ponies in your house, I think the authorities might take issue with that. ( Can they be potty trained??? Ewww.)
Is the bolded in response to a particular point out of the 20? I assume it's in response to one or more of these: 3 (crushes), 4 (sex lives), 18 (belief in marriage)? In any case, I did not understand the list as saying that your own spouses choices were none of your business; I think it refers to one's larger circle of family (i.e., other than spouses and dependent children), friends, and acquaintances. With that caveat, I think his rules still apply. If someone "makes a play" for your spouse and your spouse takes them up on it, then the fundamental problem is between you and your spouse, not between you and the other person. If your spouse turns them down but is being harassed, then the issue is harassment, not anyone's crushes/sex lives/belief in marriage. Otherwise, if your spouse invites your input in addressing the situation, then you've been invited to offer an opinion by one of the people directly involved (explicitly allowed for by the list). If your spouse prefers to handle it without your input and you don't think that's right, then that's a matter of internal relationship
dynamics between you and your spouse, not between you and the other person. Also note that the list never suggests that you're obligated to hang out with anyone you find distasteful, just that you should stay out of their business. If someone propositions your spouse, you don't have to continue interacting with them. If your spouse wants to keep hanging out with them, then again you're back to internal relationship