The likes of Twitter and Facebook just seem to attract morons who wouldn't have the guts to say half the things they do online to the person they are aiming their comments at. I'm glad this idiot has been found out tbh, his comments were completely unnecessary.
People can voice their concerns, there is nothing wrong with that, but the way in which you do it is what is important. I hardly think removing someone's racist comments is "oppressive", if they wanted to say it why can't they just write it in a private diary instead of inflicting their hurtful remarks on other people who clearly don't want to hear it.
It hardly comes as a surprise that racism is unacceptable, so if you're going to publish remarks like this online you should be prepared for the consequences.