I don 't like being called white, either. The last time I tried to put "Hispanic" (on account of my Portuguese heritage), I was kinda called out on it. Understandable for me, but for an Arab-American... Yea, they don't seem anything like your typical white.
But that's just silly. I mean that's the same ridiculous logic krazen tried to use to pass Pat Toomey off as an example of a minority Republican Senator (as he's half-Portuguese) and was laughed at by just about everyone. And anyone trying to pass themselves off as not white in Brazil on those grounds would be considered just as ridiculous as say someone descended from white South Africans trying to pass themselves off as black in the US...and Brazil is plurality white under its Census.
But perhaps most importantly, you'd still be considered White by the Census anyway since Hispanic is not a separate category.
I did say it didn't work. Around the 2012 election I was making it a point to do things like that. I'm just pointing out that if a European-American like myself might want to distance themselves from "whiteness" that I'm hardly surprised an Arab-American would.