Wasn't the the allegation of her being a white supremacist(outside of being pictured at her mom's birthday with a lot people were wearing MAGA hats, https://www.buzzfeednews.com/article/leylamohammed/sydney-sweeney-mom-birthday-party-controversy-maga-hats) not specifically that she started in the Jeans/genes ad, but rather when no denoucing it after the widespread backlash an only layer when asked in an interview [me paraphrasing]'That ad was pretty sus, but you're not racist right?' instead of taking the opportunity to hit the softball question out of the park and unequivocally denounce racism she responded with the weaselly:

"Anyone who knows me knows that I’m always trying to bring people together. I’m against hate and divisiveness," she says. "In the past my stance has been to never respond to negative or positive press but recently I have come to realize that my silence regarding this issue has only widened the divide, not closed it. So I hope this new year brings more focus on what connects us instead of what divides us."

Could be wrong