Not everyone wants a surprise party, especially the people who specifically say that they don't. But for some reason, people have a hard time believing others when they explicitly say they do not want to come home to a room full of people they weren't planning on entertaining.
The teen had good reason for not wanting a party. She explained:
I (17f) have been struggling with some depression after my dad passed. I spend about a year isolated, never leaving my room, just laying in bed all day miserable. I started going to therapy and working two days a week, but the moment I come home I will still crawl right into bed. I just have no energy.
My 17th birthday was a few days ago and my mom was asking if I wanted a party, she thought it would be good for me. I told her several times that no, I don't want a party, pretending to be totally fine and happy is exhausting. Especially with that many people around.