I can't stand villains that go through unbelievable lengths just to get back at the protagonists for an insignificant reason. A whole convoluted plan to ruin their lives, killing their closest friends and family (which only provides motivation for the MC to destroy them later on), watching them at all hours of the day, etc... Do these villains not have better things to do other than obsess over this one person because they beat on some henchmen a few months back?
Not to mention the op protagonist who's still a teenager but happens to know twelve different fighting styles and can recover from just about any injury in half the recovery time (when exactly did they find the time to learn these things in the short period they've been alive?) And when they do something incredible there's always that manufactured moment of stunned awe, because the people around them with way more experience and are actual adults didn't have the foresight to show them respect, like they're at fault for not relying on someone who hadn't graduated high school yet. They were certainly proven wrong!
I can suspend my disbelief and consider teenagers capable depending on the circumstances and time period, but not in a modern setting where, "mere months ago they were only a regular kid!"
Not to say these tropes can never work, because I like cheap drama (occasionally), and I LOVE dramatic reveals, but it can't be so contrived that I'm reading and thinking, "There's no way this would ever happen!"
And what really irks me is when there is an easily solvable solution to a problem that is being faced, had someone called the police! No one, ever, will try and face a criminal on their own. Especially when it's a kidnapping victim or some sort of hostage situation. I would think that the first thing a person would do if they were being chased or threatened by someone/a group of people would be to contact the authorities.