One, generalisations are bad (i.e., "you and all the other liberals"). They're something I'd expect from a fundamentalist but I would have expected better from you. Your assumption that I am a liberal is interesting, however. Do you accuse everyone you disagree with of having different political views? No wonder your country's politics is based upon hatred of the other side.
Two, it depends on whether you were making a racist statement with said picture or not. The presence or mention of a particular skin colour does not make something racist. For example, if you were making a comment based upon the historical fact that black people were slaves, this would not be racist; if you were saying that we should go back to having black people as slaves, that would be racist.
Three, don't make assumptions about me or other people, especially about how someone would react in a certain situation. It makes you look stupid.
You're creating racism and offence where none existed. Unless you are denying that white people have been historically privileged, you really have nothing to go on here.
I'm going to drop this here because it's off-topic and isn't worth debating over. Feel free to have the last word, if you want.