It’s the Miranda Rights of the internet! (Which I came up with in the shower, because I’m just that awesome)
You have the right to not put anything on the internet if you don’t want to, however, anything you do say can and will be quoted whenever another person on the internet sees fit and it will be used in a trial where we determine whether you’re an idiot or not.
You have the right to defend yourself but it may harm your credibilty if you do not mention in your original post something which you later rely on to make yourself look better.
You have the right to threaten people with an attorney, but unless they are actually doing something illegal it won’t help much, and will only make you look like an idiot.