You do as Jesus suggests and love them.   You do not have to support their cause, but love them.  Fighting hate with hate does not work.  It only spreads more hate.  Love on the other hand disarms them and throws them into confusion. 
 I am not meaning to degrade the meaning.
If you are indeed from the south and have seen the racism you claim to have seen, then you must also agree that all races can be racist.   That is my biggest complaint is that many leftists seem to think that racism can only come from one race.