Why does killua call Alluka a girl?

Related questions

1. Is kurapika stronger than killua?
2. Does Gon meet Ging?
3. Who is stronger Gon or killua?
4. Can Gon use Nen again?
5. Is killua a girl or boy?
6. Is Ging stronger than Netero?
7. Is hisoka is Gon's father?
8. Is Gon stronger than killua?
9. What Nen type is Netero?
10. What is Gon's power?

Tags

1. #times
2. #trans
3. #family
4. #because
5. #multiple
6. #little
7. #people
8. #villians
9. #manga
10. #sister
11. #killua
12. #nanika
13. #zoldyck
14. #asses
15. #disrespect
16. #misgenders
17. #alluka