Indian parents do not believe their children need privacy. This means bedroom doors must remain open. If they are closed, it is perfectly okay to come without knocking. I am an adult but my parents still come to my room without knocking first.
Dad (opens door without knocking): Beta, Did you eat?
Me (annoyed): No, I did not. I’ll eat later.
Dad: Why keep the door closed? Don’t you feel suffocated? Keep it open so air can circulate.
BTW, if you are alone in your bedroom and doing something on your laptop, parents will assume the worst. What are you watching? You avoid bad sites, right? Sorry to disappoint you but I am not watching porn. Look, I am on WordPress. Ah, desi parents are a hoot.