This is an incomplete list of some of unacceptable, uncivilized parenting behavior. These are pretty normal in our culture, but should be viewed with horror. They're pretty blatantly intolerable to a reasonable, classically-liberal-minded person.
Making children do things they don't want to (e.g. making a baby go in a carseat when their crying indicates they don't want to, or enforcing an unwanted bedtime, or making a child brush his teeth or take a bath when he'd rather not, or making a child go to school). In general anything that causes crying or "tantrums" indicates the parent is doing something wrong.
Anything that relies on parent being bigger/stronger than child, such as spanking or carrying a child from one location to another when child doesn't want to be moved (which is literally assault and kidnapping – it should be a crime).
Rules that child doesn't like.
The parent putting his foot down or doing "nicer" pressures and manipulations to get his way. Frowning, having a stressed voice, or being selectively less energetically helpful/friendly/cheerful can be pressuring and controlling. (E.g. parent is "too tired" to do an activity child wants, but would suddenly be available if child wanted to do a different activity that parent cares about more.)
Screen time limits.
Not getting a baby an iPad and helping them get apps and use it (by around 6 months old, for people who can afford one).
Having multiple children. (Parenting one child well is hard enough. Having more kids is much harder. That guarantees more mistakes in the treatment of the first child. Knowingly, intentionally guaranteeing to treat one's first child worse is a betrayal).
Posting baby pictures online (privacy violation).
Skipping vaccines (scarily trendy lately and literally killing kids), or denying children anesthetics for shots.
Circumcision (genital mutilation).
Having child to evaluated by a psychiatrist or giving him psych drugs, or letting a school do this. ("Mental illness" is a myth, and psychiatry is an attempt to "scientifically" legitimize the use of violence against non-criminal non-conformists without following the rule of law. People today are imprisoned without getting a trial, with psychiatry as the excuse. Psychiatric drugs literally cause brain damage – as their primary effect, not a side effect.)
Giving children (oral) herpes (sometimes called "cold sores"). Herpes is widespread and uncurable, and is often spread by people kissing babies without adequate medical knowledge or herpes testing.
Not prioritizing what child wants. The parent's proper role is as a helper to enable the child to get what he wants, not to control the child. That means e.g. helping child get sugar and other foods he likes, and "violent" games and movies he wants.
Ask questions or add to the list, in the comments below!