Can only really give anecdotal examples.
A horrid old cousin of mine and his cronies, great fans of Arthur Scargill, Michael Foot and more recently Corbyn still use the most abhorrent racist language.
An apparently intelligent, degree holding, Conservative voter I know is overtly racist.
A Libdem acquaintance was recently overheard complaining at falling property values as the area was being taken over by ......................I won't repeat his words but believe me they were racist.
I have friends of all colours, creeds and political persuasions who are not racist. Good and bad in everyone but thankfully mostly good.