Mostly syed families don't accept marriage proposal from nonsyed families . What is in our religion Islam about marriage between a syed ( female ) and a nonsyed ( male )?
Some words from Prophet Muhammad (S.A.W) last Sermon:
O People, listen to me in earnest, worship God (The One Creator of the Universe), perform your five daily prayers (Salah), fast during the month of Ramadan, and give your financial obligation (zakah) of your wealth. Perform Hajj if you can afford to.
All mankind is from Adam and Eve, an Arab has no superiority over a non-Arab nor a non-Arab has any superiority over an Arab; also a white has no superiority over a black nor a black has any superiority over white except by piety and good action. Learn that every Muslim is a brother to every Muslim and that the Muslims constitute one brotherhood. Nothing shall be legitimate to a Muslim which belongs to a fellow Muslim unless it was given freely and willingly. Do not, therefore, do injustice to yourselves. Reference
I think this reference is enough for the answer you are looking for.