Simply because a caucasian actor portrays an asian in a film (even if it's a caricature of an asian), does not make the actor rascist. I.E.:
Tony Randall played the asian Dr. Lao in "7 Faces of Dr. Lao".
Luise Rainer (French) and Paul Muni portrayed asians in "The Good Earth".
And in 1922, Lon Chaney portrayed an asian in "Shadows".
Mickey Rooney at Archive.org. (Including episodes of his 1954-1955 TV show.)