All of the Haitians, being French-speaking, hear little difference in pronunciation of the words "Haitian" and "Haisian." Thus the difference is in the eye of the beholder -- slanted or rounded.

Bro since I got dirtpilled on Tuesday I have made sooo many worm friends and made them soo many little houses to get married in. Me? Lonely? No you’re the lonely one u lawn owning freak

If her mom is asian, and her father is haitian, that would make her an adorable haisian.

American: I heard that girl is Haisian.
Brit: But she is asian you daft cunt, do you mean Asian-Haisian?
American: *Confusion*