Why don't stewardesses like flying to Hangzhou?

Because most passengers on such routes don't like to wear seat belts. In fact, it is required to fasten your seat belt all the way on the plane, just to prevent accidental bumps from causing injuries. Flight attendants don't like to fly to Hangzhou because most passengers on such routes don't like to wear seat belts, because after flying for a long time, someone will stand up and walk halfway.