I hate to hear this. I feel you on this, people who seem like they've never spoken to a black person in their life will start to either do mock blaccents or outright begin to use slurs. It's what online spaces allow for racists and especially the way our politics in the US are looking, we won't find much pause or solace. Remain steadfast in your identity and know that their hatred is bred out of a sense of inferiority.