If I say "Person X is a racism mother****er", I mean "Person X is racist against group/race Y, and I dislike him/her/it because of it".
If I say "Many governments maintained racist policies and laws well into the 20th century, one example of which is the institutionalized racism in some southern states of the USA.", it obviously describes a far worse situation.
Neither is acceptable. But the former is at least tolerable, because it's just one person being an idiot. In some ways I think such individuals are necessary, as examples of what to avoid.