I feel like if the sister was an ugly mom/dad and said the exact same words, everyone here would be like "What a controlling asshole!" But because the sister had a cute blushy embarrassed face and a gap moe people are discounting her completely controlling his life to the point he feels trapped.
Lots of people have severe anxiety, myself included, and the worst part is the people around you having to suffer because of it. But that doesn't justify it, and if you are the parent or guardian that just turn into child abuse when it's directed at them.
Want to give your kid a personality disorder, just act this way.