Brotherhood in Islam

It is for centuries that the black people have been undergoing hardships and oppressions. Their bathrooms, coffeehouses, hospitals, schools and cemeteries are all separate.
Islam has very strongly censured this sort of discrimination among various classes of people. The Holy Qur'an says:
Men, We have created you all male and female and have made you nations and tribes so that you would recognize each other. Honorable among you in the sight of Allah is the most pious of you. (Surah al-Hujurat, 49:13)
Among the signs of His existence is the creation of the heavens and the earth and the differences o f languages and complexions. (Surah ar-Rum, 30:22)
The Holy Prophet on his farewell pilgrimage (hujjatul wida) said to a large gathering: "You Muslims are equal to one another no matter if you belong to one or the other tribe, race or language". (Safinatul Bihar, vol. II, p. 348)
The Holy Prophet used to award positions of dignity to the slaves and solemnized intermarriages between the white skinned and the back-skinned couples so much so that he wedded his first cousin, Zaynab, the daughter of his father's sister to a black-skinned slave so that the evil of superiority amongst the believers might be nipped in the bud.
False Criticism: The Almighty Allah has rejected the superiority of the Quraysh who considered themselves superior to all others. The Holy Qur'an says:
Then move onward from the place (Arafat) when all the People go. (Surah al-Baqarah, 2:199)
The above verse was revealed when on the occasion of the Hajj, the people of Quraysh considered themselves superior to others by being the custodian of the Holy Ka'ba and for this reason, while performing the rites of the Hajj, they did not go to 'Arafat and instead went to Muzdalifa. They said that since they belonged to the Holy House of Allah (Ka'ba) they would not go to another place. Then they were asked to give up their feeling of superiority, and that they should go to the same place where others were going.

There is a Difference between Adopting a Principle and Trading
The influential people looked down upon the followers of Prophet Nuh and insulted them. They made a proposal to him that if he abandoned associating with poor people they would keep his company. However, since Prophet Nuh always upheld the cause of the poor and the downtrodden people he turned down their proposal. According to the Holy Qur'an, he said to them:
No one except Allah has to give me my reward. I do not drive away those who have faith (in my teachings), they will all receive mercy from their Lord. (Surah Hud, 11:29)
The matter, which is of paramount importance to us, is to uphold social justice and protect our ideology. We should only invite people to this concept and not that we should ignore one aspect of it and give up justice and equity to build up the strength of our supporters. This sort of thinking is like business and blind following and does not mean protection of ideology and worship of Allah.