Green’s Dictionary of Slang

1. a white person.

1960, 1975		Wentworth & Flexner DAS 258: Hinkty, hincty...A white person [DARE].
1984		R. Wilder You All Spoken Here 171: Hincty, hinchy: Sporty patrons of sporting houses—white, overbearing, pompous, some wearing pearl-buttoned spats with revolvers to match.

2. a snob, an arrogant, self-opinionated person.

1970

in DARE.