people who are from these areas will say "i encountered more racist people in the north/west/whatever" but they're usually just referring to people who shared their racist opinion with them, not actually being on the RECEIVING END of a racist interaction.
which MAKES SENSE if you think about it - white people in manhattan or SF or LA are basically going to feel like a minority, and may seek a little bit of empathetic camraderie by complaining about race X Y or Z. if a white person does this in vastly majority white area they're just going to seem like an asshole with a chip on their shoulder.
the coastal areas make it easy to blend in no matter who you are. nobody is going to hassle you or ask you stupid ass questions.