What I wanted to ask was what did Beyoncé do/say that led people to see her as white?
KateinKorea Beyonce has never done/said anything to present herself as white.
The Saturday Night Live skit plays off the idea that, for years, people have unconsciously been perceiving her as racially neutral. She's been a performer from a young age, and has generally been marketed as cheerful/feisty/sexual, but never particularly challenging; few of her earlier songs touch on issues that many people would rather ignore. She sings about love and generic empowerment.
Black artists who do mention race issues are often stigmatised as being difficult, irrationally confrontational, 'too sensitive', angry, hectoring, and only of niche appeal. It's probably black female performers who get the least leeway on this, since women expressing anger are difficult or unstable, whereas guys at least get respect for being a wild card or outspoken.
There's a bit in the SNL sketch where a woman's friend says to her '...but I'm black' and she says 'no, you're not... you're like, my girl'. And then she looks at a guy standing on the street corner, wearing a cap and combat jacket, and adds something like 'I know he's black'. It's satirising the way plenty of people aren't overtly racist (and would be mortified to seem that way), but mentally divide African Americans into neutral ('you're like, my girl') and 'black', ie different, impoverished, potentially threatening, 'ghetto', hostile, poorly educated, using distinct speech patterns, socially and culturally separate... a million different things, very few of them positive.
When someone perceived as 'neutral' starts a) mentioning their heritage in a specific way -- not explaining it, for other people's amusement or interest, but actually referring to it using cultural references other people may not even understand, and b) pointing out inequalities or c) complaining about real difficulties and injustices... it can freak people out. Like the hysterical fake-movie title, they're 'turning black'. There's been a huge uproar in the States about Beyonce's Formation track, and Superbowl performance, and then the whole album.