Parent-child relationships can be complex, but when you enter adulthood, the complexity can multiply. Whether you've had a great lifelong relationship with your parents or it's been a constant struggle to stay on their good side (or vise versa), as an adult, there are certain things you should never put up with from your parents.
Whether they mean to push boundaries or not, as you grow up, so should the parent-child relationship. For some, enjoying a great, mutually-respectful relationship with their parents is the norm. For others, constant discord is their "normal" when dealing with their mom and / or dad.
Although most can probably come to the same conclusion without the data, a study published in the National Institutes of Health determined that conflict within the parent and adult-child relationship is common. The history of the quality of the relationship, it determined, was the main indicator of whether or not a parent and their adult child would go on to experience problems later on.
Instead of simply writing off your poor relationship, knowing what is and isn't acceptable behavior from your parents can help you learn to set healthy boundaries and, if necessary, talk with them about why the following behaviors only drive the wedge further.