Unfortunately there are people in this world that would rather bring hurt on others rather than accomplish something themselves.
There are a lot of racist people that actually believe that although they may make the odd racist comment that they are not actually racist. This is pure ignorance on their behalf. There are absolutely no circumstances where making a racist comment is acceptable. None. People need to take responsibility for what they say or post on the internet. You are making the racist comment to hurt the individual. It is completely unacceptable.
Making a racist comment, or uttering a racial slur simply exposes one as ignorant with an irrational fear of what they perceive as different.
Anyone that makes racist comments needs to pull their heads in and have a good hard look at themselves.
The worst part about it is that so many elements attributed to racism are natural to all human beings. Like it or not, we are cautious about people and circumstances that are not common to our experience. We form long-standing habits that go way beyond brushing our teeth or collecting barbed wire. These brains are primitive, designed for living in the wild. Trying to reprogram them with messages of hate, isn't very smart.