It could mean a few things if a black woman or another person in general tell u "u look like u like white girls."
It could mean u seem straight laced, square, white washed, white folks worshipping, intellectual, nerdy, untrendy, too plain Jane or should I say Plain James lol, or u fit a white man look or stereotype, like u loom like a Gothic or alternative black person, skater boy type, surfer boy type, the hiking type, black rednecks, etc. Or u could be an uncle Tom or a self hating niqqa and people can sense that too.