What in the hell is this question? There are so many issues with this question alone and the answer is no, there is never a case when this is warranted but let's also be clear that racism is based on power dynamics and white people will say they have experienced racism from oppressed people when it is 100% not true. But that you confidently asked this question tells me that you don't actually understand what racism is or how it functions. It's more than a disagreement and this entire post is gross.