A lot of people suck at parenting which is obvious for everyone but them. Listening to some advice would help them but usually it's the attitude you present that prevents it.
Here is one example: if your kid tries to sabotage you into buying drugs (sweets) in the middle of the supermarket by throwing a tantrum you don't cave. It's simple and obvious yet so many "just don't give me advice" parents are unable to process and apply it rationalizing why they are in very special situation and no one else could possibly understand. They go and buy more drugs to their already overweight sugar addicted children just to get some temporary relief contributing to child's demise in the process.
Here is one example: if your kid tries to sabotage you into buying drugs (sweets) in the middle of the supermarket by throwing a tantrum you don't cave. It's simple and obvious yet so many "just don't give me advice" parents are unable to process and apply it rationalizing why they are in very special situation and no one else could possibly understand. They go and buy more drugs to their already overweight sugar addicted children just to get some temporary relief contributing to child's demise in the process.