I quietly don’t obey laws that I don’t think are just or constitutional. And I don’t plan on filling out the healthcare form on my tax return or registering guns (er..if I had any). Problem is I’m only one person so it probably doesn’t help unless a lot of people do it. Supposedly the IRS doesn’t have enforcement powers (yet) on the form so that seems to me to be a good place to start.
Civil disobedience is not a private affair. It is, by definition, an open act of principled rebellion against certain authority. It may be nonviolent or it may not. It is highly public and in-your-face directed at those who support the authority in question.
Civil disobedience is not opposition to a law or set of laws. It is an act of disobedience directed at specific authority. If there is no agency enforcing the law there is no civil disobedience.