Racism whether upon open or hidden, is an evil aspect of life which Islams seeks to eradicate. It is clear from the versus of the Quran, and many sayings of the Prophet (saw) which have been narrated by his companions, that differences in colour, tribes, races, or traditions are not to be excuses for unjust behaviour or treatment.

"O Mankind, we created you from a single pair of a male and a female, and made you in to tribes and nations so that you may know each other (not that you despise each other). Verily, the most honoured of you in the sight of Allah is he who is most righteous of you." (Al-Quran, Chapter 49, Verse 13)

https://www.youtube.com/watch?v=3MqeSPF48tg