Added 4.14.16 (Original convo 4.03.16)
Does Islam say love those who hate you? or is that just Christianity?
The example of the Prophet Muhammad, peace on him, was to patiently call everyone to good and success, even those who did hateful or sinful things. For example, a man used to leave garbage at the door of the Prophet, peace on him, every day. The Prophet remained patient and did nothing about this until one day when there was no garbage. On that day, the Prophet, peace on him, went to visit the man and ask if he were not feeling well. The man was surprised that while he had put garbage at the door of the Prophet, the Prophet returned that bad treatment with kindness. The man was impressed to the point that he embraced Islam and became a Muslim.
In another case, the Jewish scholar Zaid ibn Su`nah openly insulted the Prophet, peace on him, and rudly demanded repayment of a loan before its agreed time. Umar was angered by this and told Zaid, "If I were not concerned with [the Prophet's] leaving us, I would have struck your head with my sword." The Messenger of Allah, who meanwhile had been keeping a calm demenour, said, "O `Umar! We don't need this. I was more in need of your advice to pay off his loan well, and he your advice to deal courteously. Go with him `Umar, pay off his loan, and give him twenty extra saa` (44 kilograms) of dates because you frightened him." [Transmitted by Tabarani (al-Mu`jam al-Kabeer), to which al-Haithami says that all of the narrators of the hadith are sound. Also transmitted by Ibn Majah, Ibn Hibban, and Hakim, among others.]
There are many other examples like that from the lives of the Prophet and righteous Muslims which demonstrate patience and good character in the face of poor treatment from others. As well, Islam especially implores the Muslim to treat family members kindly, even those who do not treat us well. Unfortunately, not all Muslims live up to that model, but it is part of the message of Islam.